Apr 16, 2013 · 862 s Vs 243 s..... So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4. ...When I first started playing with engines (don't go there, I'm old), and the heads had worn valve guides, it was common practice to either: a)Get them knurled. or. b)Get the stock guides replaced with bronze guides. Bronze guides were considered "THEE best", aka "the shit". Now I'm reading "If you have bronze valve guides you NEED roller …The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. ... There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM …The United States became an independent country on July 4, 1776. This means the country turned 243 years old in 2019. The United States of America formed after the colonies decided...So, I am not sure if that would work and if I should get another 706 or 862 head to make the heads match but I'm trying to do budget build. Thanks SPONSORED LINKS. Tuesday, November 21st, 2023 AT 4:39 AM. 3 Replies. MONSTERTRUCKDADDY MECHANIC; 30 POSTS; Hello HD1200, If the combustion chambers CC are the same, and the spring installed heights ...118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote.CorvetteForum - Chevrolet Corvette Forum Discussion. C5 Corvettes, 1997 - 2004. C5 Tech. 243 heads. C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace.BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. Generation III V8 cathedral intake port cylinder head. Casting 12564243. For truck, van, SUV and perfomance applications. Used on LS6, L33, L20, LH6, LY5, LMG, LC9,LS4, LH8, LS2, LFA, LZ1 engines. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It ...So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4.8? 862 s Vs 243 s.....118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote.I would think a 243 head is a 243 head, I think I read that the 243 was used on the LS6 Z and all LS2 motors had the 243 heads. Mr.Bill Reply Like. 09-27-2011, 08:43 PM #3 Eddie 70. Race Director . Member Since: Feb 1999. Location: Lenoir City Tennessee. Posts: 19,658 Likes: 59 Received 29 ...Tested on a different application, the results would certainly be different. On many of the heads, the results varied by only a couple of horsepower. In the grand scheme, that's insignificant....Locate 862 Heads on sale below with the biggest option of 862 Heads anywhere online. Automobile Parts and Service Toggle navigation Community Chevy Automotive Sales Inc ... Gm Ls 706 806 862 241 799 862 243 Cylinder Head Rebuild Service 3 Buisness Day $459.99 View Item Details Chevrolet Gmc 5.3 Ls Gen Iii V8 Ohv Cylinder Head 862 2 ...The intake manifold is the most important element in swapping from a cathedral to a rectangular port head. To match the runners, this factory LS3 (PN 12610434) or an L76 manifold are the most popular. It is important to note that there are some minor differences between the L76 and LS3 intakes, such as a screw-in MAP sensor instead of the Gen ...It turned out 300hp/367TQ to the rear wheels. From what I've researched parasitic loss in rigs setup similiar is much higher than 30%. Other people have experienced 40-55%. That puts mine at 500-550. With the additional displacement in your engine, 540 sounds right.looking at ported heads. vs new heads and flow numbers. TEA has some great flow numbers on 243 heads and i have a set headed that way, but, looking thru builds online vs bbc builds, thinking about 310 cfm at .600 lift numbers in an ls, dont see many builds that make 2 hp per cfm, wondering were the limitiing factor is, intake manifolds ...Intro to the LH6 Engines. The LH6 came in GM trucks and SUVs in 2005-09 and made 315 horsepower right out of the box. It's a Gen. 4 5.3L aluminum-block engine, so you're getting the better intake manifold, connecting rods, and ECM. The engine also had 799 or 243 casting heads which are closely related to the LS6.Street Performance of The 706 Head. It’s worth noting that the 706 heads have a larger combustion chamber than the 862 heads, which measures at around 71cc. While this might sound like a disadvantage, it can actually be helpful for engines running on lower-octane fuel or those using forced induction.The 862 heads are a popular choice for those looking to increase the power of their engine. These heads can provide an increase in performance by increasing the airflow to the cylinders. They are also known for their ability to improve the fuel efficiency of an engine. But, are 862 heads really worth the money and effort?The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243's. Valve sizes are identical in both sets of heads. I know that when replacing heads you should have them worked (e.g.- valve job, and such).Mar 27, 2010 · If you are just installing stock heads with no work, forget the 5.3 heads and just get a set of decent 243 heads which will still bump CR up 1/2 point on the LS1 (64cc combustion chambers compared to 66 CR of the 241 heads). 2004 torrid red with red interior A4 GTO (1 of 499)Oct 15, 2021 · Beyond everything, 862 LS heads offer enormous power at a budget-friendly cost. Also, there are hundreds of thousands of 1999 862 heads and up to 4.8-5.3 truck heads: 61.15cc available to port. Why casting 862 heads is a great choice . If you are still not convinced, read through to understand why casting 862 heads is a great choice. They are:A comparison of EQ's cathedral-port intake port windows revealed the "317" casting (left) to be 3.19 x 0.965, while the "243" unit was 3.149 x 1.035. Both ports weigh-in at 211 ccs. From a pure...I've got the opportunity to pick up a set of 862 heads for a good price. I know that these heads flow pretty well but with higher compression. My question is can they be made to flow as good as 243 heads or close to it? And would it be worth it for me to do that? I'm only planning on lightly modding my truck, cam, head work, LT headers, 3000 stall, gears, intake and injectors.The 2007 year had three 5.3L motors offered. The 2007 Classic (still a NBS) had the 5.3L with either the L59 (flexfuel version) or the LM7. The 862/706s are on the 99 and up 4.8/5.3L motors. The only difference about the L59 motor was the injectors. 2005 and up motors had the factory electric fans and electric TB.64nailhead. 4523 posts · Joined 2012. #5 · Jun 13, 2020. Here's your decision - the 317's will work better if you're looking for boosted 1000+ HP, but the 243's will work better everywhere below that. Something to keep in mind, old school SBC and SBF static and dynamic compression ratios do not apply to LS heads.Milling Heads for a desired Compression Ratio. Enter the required information into the boxes and click results! Tip! This Calculator is designed to tell you how much you need to mill your heads to achieve the. specific Compression Ratio you are looking for. Compression Ratio, go to the Compression Ratio Calculator to figure it.The 2007 year had three 5.3L motors offered. The 2007 Classic (still a NBS) had the 5.3L with either the L59 (flexfuel version) or the LM7. The 862/706s are on the 99 and up 4.8/5.3L motors. The only difference about the L59 motor was the injectors. 2005 and up motors had the factory electric fans and electric TB.They seemed like a good idea at a time, but these sbc TW heads had a lot of problems. Firstly, they were never designed to be a serious performance cylinder head. Where they did fare acceptably was on a mild street sbc with a low lift, short duration camshaft. I did own a set in the past, and have seen several sets come through the shop.It uses a shorter case than the .243 Winchester—1.920-inch vs. 2.045 inches—allowing for a longer bullet length outside the case in the same length magazine, and maintains the 6.5 Creedmoor's 30-degree shoulder. Snow has found this extends brass life, as well as giving more room in the shortened case. The Hornady Precision Hunter load ...The 706Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand cast. The SPM method is considered to be a more consistent process, but once you port the 862 head, any difference to the 706 head goes away.Bandaging that gnarly cut before you head to the emergency room? Snap a pic first. We’ve advised you before to take photos of your children before a big outing, screenshot your boa...To 2007 head issues #243 vs. #799. C6 Tech/Performance - 2007 head issues #243 vs. #799 - I read a thread not long ago on C6 general about a difference in the heads on the born in Oct. 06 C6's that GM used, they used #799 heads as opposed to #243 heads. The person who wrote the thread said his numbers on the dyno where significantly off from ...I recently heard that the 862 heads outflow anything else out there for the LS platform. Is this true? I'm currently running the 799 stock on my 5.3. But I can pick up some cheap 862 heads locally. Got a long list of things I'm about to do on my truck, just wanted to ask to see if it would be worth switching up the heads while I'm at it.FULL RESULTS-BIG LS3 HEAD TEST, AIRFLOW AND POWER! STOCK LS3 v PORTED STOCK v AFTER MARKET. Check out the results of our big LS3 head comparison. We ran the ...If you are just installing stock heads with no work, forget the 5.3 heads and just get a set of decent 243 heads which will still bump CR up 1/2 point on the LS1 (64cc combustion chambers compared to 66 CR of the 241 heads). 2004 torrid red with red interior A4 GTO (1 of 499)PRC LS3, L92, & LSA CNC Cylinder Head Porting (Customer Supplied Castings) $ 899.99. Cometic Ford 5.0L Gen-1 Coyote / 5.2L VOODOO Modular V8 Intake Manifold Gasket Set $ 29.23. Cometic Ford 5.0L Gen-1 Coyote Modular V8 .027" MLS Cylinder Head Gasket, 94mm Bore, LHS $ 132.74. Military And Law Enforcement Discount . CONNECT WITH US.After installation of the heads, offset rockers, and FAST LSXR intake, the LS3-headed stroker pumped out 581 hp and 543 lb-ft of torque. Note the LS3 heads increased both peak power and torque, though the rec-port heads did lose out to the 317s below 4,000 rpm. Despite the slight loss down low, torque production with the LS3 heads bettered 500 ...Originally Posted by silverz28camaro. the 853 heads are stock from 98-00, then they had the 241 head which was pretty much the same head. If you find a 243 head then you are in business they are the ls6 head. If the 853 you have now are ported then you may have something. Take pics of the intake ports and post them up.Nov 21, 2023 · The 862 heads have a smaller combustion chamber size than the stock 243 heads. The chambers measure 61cc, which bumps static compression over 10:1 with a standard 3.622″ LS crankshaft. This can improve the power output and durability of the engine.53 posts · Joined 2010. #4 · Nov 12, 2017. Unless you're spending money on AI ported 243's, go with the LS3's. LS3's flow more and will keep the port velocity up compared to the typical hogged to hell port jobs I've seen on factory cast heads. There are very few shops that port heads well, with AI being the best around.I've had some emails and messages, on the SierraC3TV Facebook page, making arguments against using 706 heads on my 6.0. In this episode, I give my reasons wh...862 heads vs 243. The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of the two heads.13K views 96 replies 22 participants last post by treys06GTO May 31, 2013. 420GTO Discussion starter. 1052 posts · Joined 2006. #1 · May 22, 2013 (Edited) There are a set of 243 heads available ported by AI, 232CC package including Comp dual springs, but for a lil more ($400) there are a set of AFR 205's OR Cartek 4x heads available.862 Heads This site contains Ebay partner affiliate links, which may earn us a commission at no additional cost to you. Gm Chevrolet Gmc 4.8l 5.3l Cylinder Head 862 Assy W Rocker Arms40 posts · Joined 2018. #46 · Jan 20, 2020. Your 6.0 block is a 4.00 inch bore, you have to run a LS3 type head 5.3 and 4.8 have smaller bores. There are tons of heads out there yours probably came with the 799 castings like my 6.0 did.So i just bought a set of 243 heads and i was wondering if i should run them as is or have them worked a little bit (ported,polished, shaved etc.). I'm running a 220/220 .551 112 cam and ls6 intake but i dont want the heads to flow too much... and won't these heads stock lower my c/r since they have a larger combustion chamber? I haven't really dealt much with heads and what not so any advice ...Ai 218cc CNC'd GM 243 LS2/LS6 Cylinder Head Package. GM's #243 casting is a great cathedral head that has phenomenal potential with the right work applied. Our 218cc CNC work is a good choice for guys who would like a bit more gain than our Performance Rebuild, but are not inclined to port the casting to its potential.862 heads with a valve job and BTR springs/retainers and a trunion upgrade on the rockers BTR stage II turbo cam compstar rods and DSS flat top pistons ... A real L33 would have 799/243 heads. My L33, stock crank, good rods/pistons (10.25:1) w/799 heads, and John Bewely's (LJMS)stg 2 turbo cam, has made 975 on 23#, and very mild timing. C16.Patriot Performance 2033: My run a total 24 degrees of timing with 93 octane. These heads provide up to a 65 cfm improvement over stock OEM versions. The 59cc chambers (achieved by milling), will increase the compression on a stock LS1 from 10-1 to 11-1. Based on other modifications, gains of up to 40 rwhp can be expected.we compared 243 heads to 862 heads, ported, chamber work & big valve. let's talk tech, anyone ever see a set of stock 243 heads flow 270+ cfm? we compared 243 heads to 862 heads, ported, chamber ...The 243 heads were also used on the Corvette LS6, but true LS6 heads had the light weight sodium filled valves. All these numbers we are throwing around are the casting number and they are stamped on the outside of the head. It's also the last 3 digits of the part number stamped under the valve cover.In terms of cylinder heads, we included the 706 small-valve 5.3L heads, the 241 (LS1), 317 (6.0L truck), and 799 (as a stand-in for the hallowed 243) heads. The idea was to flow and measure each ...Thanks and for those that are intersted this is what was found thanks to Lothar pointing out my crappy search terms. Casting Number 241. Head: 1997+ LS1 5.7 Litre Passenger Car. Material: Aluminimum. Part Number: 12559853 (1997-98) 12559853 (1999-00) (not sure why same PN) 12564241 (2001-03) Combustion Chamber Volume: 66.67cc.doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp..St. Jude Donor '03. 853 and 241 are basically identical. 853 was used on 99-00 LS1 engines. 241 was used on 01-04 LS1 engines. They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports. The 243 head is the 01+ LS6/LS2 head.The price difference for 799 an 241 heads is because the 799 is a twin to the 243 an have better ports an 64.54cc chambers where the 241/853s have not as large of a port an are 67cc..your 862 is actual the smallest chamber head being 62cc but their down side is smaller valve size an slightly less flow then 241/853 heads..Jacob Andreou is leaving Snap after eight years to join Greylock as a general partner. T Snap’s head of growth and previously longtime product head Jacob Andreou is leaving the soc...823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. This means that 823s offer and promote better overall performance in the vehicle's combustion chamber.Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5.3-liter heads on a 6.0-liter. Our 5.7-liter head test bumped the average power by 9 hp but ...GM LS6 LS2 Gen III Gen IV Cylinder Head 243 Assembly Set w/Rocker Arms OEM. Opens in a new window or tab. Remanufactured. $685.75. rollingautomotive (21,312) 98%. Buy It Now. Free shipping. ... GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Save up to 10% ...More video to come. Put new heads and new cam in my 6.0 lq4 283 int/286 exh 114 LSABy Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has several main functions. Its first order of business is sealing the top of the cylinder (the piston seals the other end). The second order of business is to provide a way for ...Chinese authorities are investigating Meng Hongwei, who has been missing since late September, for taking bribes. Two years ago, Meng Hongwei became the first Chinese person to hea...Richard Holdener. 293K subscribers. 2.7K. 174K views 4 years ago WESTECH PERFORMANCE GROUP. ...more. 706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH …Richard Holdener. 293K subscribers. 2.7K. 174K views 4 years ago WESTECH PERFORMANCE GROUP. ...more. 706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH …Quick tips for porting and polishing any LS heads My IG: 13b_dorito Here is some useful links for tools that you need to get this job done and that you will ...LS1 LS6 243 / 799 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads. $599.95. Options. Valve Job with new Valve Guides + $400.00. Resurface for MLS Gaskets + $150.00. Cylinder head Assembly + $150.00.706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. We ran the 706/862...GM's #243 or #799 LS6/LS2 head casting is the most sought after GM cathedral port casting. At a mere 15 cc over stock volume this particular port sees gains of over 40 cfm on the intake utilizing a factory GM 2.00" valve. This package has found great success amongst enthusiasts seeking area under the curve, phenomenal throttle response, and no ...The main difference between 799 and 243 heads is the amount of valve lift that they can provide. 799 heads have a higher valve lift capability than 243 heads, meaning they can provide more airflow into the engine. This often results in increased power output from the engine. 243 heads also tend to be lighter than 799 heads, which can be ...The 243 heads came on the powerful LS6 engines from 2001 to 2006. Although the heads were initially made for C5 Corvettes, they later found their use in engines like the truck-spec LQ9 and LQ4. The LQ4 and LQ9 had 6 cc larger combustion chambers. LS6 was also used in some Camaros and Pontiac GTOs. The 243 heads are cast out of aluminum alloy ...863. Rectangle. 4.750" +- 0.003". 12604861. 12610716. 12675872. Share this article. We've tried to boil down the GM part numbers, casting numbers and other LS cylinder head information into an easily usable (and ideally definitive) cross reference. Note that we're not perfect and some of this data may not be perfect so use it for what you will. Street Performance of The 706 Head. It's worth noting that the 706 heads have a larger
So I have a friend who's got a 5.3 for sale supposedly out of a 2007 truck. I'm not sure were to look on the motor to know this for sure it has 862 heads which all the info I could find was that they came on the 99-00 5.3. It has a fan which I thought 05 ups had electric fans. I pointed this out to him which he pointed out it also has electric tb.The head casting numbers are typically 706 or 862. To verify that Castech heads are installed and cracked: Remove the valve cover and valve rockers. Locate the Castech mark under the valve rockers. Small amounts of orange DexCool may be visible in the oil drain wells or around bolt heads (as shown in Figure 3).799 LS Engine Cylinder Heads are some of the most recent cylinder heads on the automotive parts market. The cylinder cast architecture is with a semi-permanent mold method. The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. However, unlike the 243 heads, they do not require ...1320 posts · Joined 2008. #6 · Feb 25, 2009. I've done both, and I don't think they have the same ports. The short side on the 317 intake port is a lot thinner than a 243 on the ones I've ported and sonic checked. The 243 intake port is better, based on the castings I've seen and sonic tested.The AP220SP is the biggest 23* head All-Pro has before you get into raised runner designs. It is also standard valve spacing. Flow numbers @ 28" of water. All figures in CFM. All-Pro AP220-SP-23* --- ~$3,350 (uses standard valve train and fully CNC'd runner) Intake 219cc Exhaust.799 is a 5.3 liter head. My 5.3 came with 862's, and my chambers are 61 cc. ... Some LS2's also came with the 799 heads. As stated above they are the same as 243 heads with a different casting method. They should have 64cc chambers. Save Share. Like. 0 Reply. S. ... plus they did the 317 headed 6.0L before they did the L92 headed ones. 345hp vs ...Location. Pensacola, FL. Posts. 1,263. The 243's bring about $400-450 with springs. I feel like the cathedral heads produce more low end torque compared to the LS3 heads. I dont really miss it while autocrossing, but I notice it more in daily street driving situations. The LS3 heads pull pretty hard up top.By Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has …Nov 10, 2023 · The 799 and 862 heads have their own pros and cons. While the 799 heads offer better flow and performance, the 862 heads offer better combustion chamber design and improved efficiency. Ultimately, the choice depends on the specific needs and goals of the engine. Pros of Using 862 Heads. Cons of Using 862 Heads.It still used 799/243 heads but also utilized variable valve timing and had flex-fuel capability. Chevy also used a 5.3L engine that was only in vans produced from 2010 to 2014, known as the LMF engine, identified by a number 4 in the 8th digit of the VIN. ... some include 1218 springs and the Elgin 228/230 cam. If your truck has 862/706 heads ...Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J...European heads of state are meeting today in Brussels for their latest bout of dialogue on the EU crisis. European Council president Herman van Rompuy writes, “The main purpose of ...The first has to do with port shape. The LS6 and the later LQ9-LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled ...Are the 799/243 that much better ported , then the 862 ported with bigger intake valves? Heads are for a turbo car running M1. Thanks Mike. in this thread in this sub-forum in the entire site. Advanced Search Cancel ... 862 5.3 heads. Jump to Latest Follow 1 - 3 of 3 Posts ...Showing the progress Porting the 862's for my Turbo 4.8 project. Yes it's a slow process and I limit how much I can do each day.I'm in the dirtiest portion ...The 799 cylinder head is a better choice than the 243 cylinder head because it has more capacity. Cylinders are the chambers in an engine where the fuel-air mixture is ignited by the spark plug. The combustion of the air and fuel inside a cylinder creates pressure, which forces out a piston on one end. A cylinder head is a part of an engine ...For the price you pay for us to port 241s they will flow the same numbers as a stock 243 head." ... but I just noticed that Ai's 706/862 5.3 heads flow tremendously especially on the exhaust CFM (269CFM at .600). I just don't know how I could really benefit more from such a high exhaust CFM vs. having a higher intake CFM on TSP's 2.5 LS6 ...243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications*** 862 99 and up 4.8-5.3 Truck heads 706 99 and up 4.8-5.3 Truck heads 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads 873 99-00 LQ4 6.0 Iron center bolt headsSimply put, the .243 Winchester became the darling and the .244 Remington became the goat. The reviews took their toll, and the .244 Remington began to wither. In 1963, Remington made their first attempt at the name game. They revised the rifle and ammunition, equipping it with a 1:9″ twist rate in 1958 and renamed the cartridge the 6mm ...There characteristics are for the most part understood by most, and most importantly, by myself. Extracting power is surprisingly easy as compared to it's Square Port cousin, by me at least. The fact that the intake flows around 290cfm (LS3), and has a head that flows roughly 330-360cfm, to me means reversion hell.Engine Technical. Engine Tech And Modification. LQ9 build cam suggestions. I just got my 4x4 T56 swap completed and now I'm planning a nice NA build. Through research I've found that the 243 heads and TBSS intake are a nice combo with CR around 11:1, and basically my whole setup hinges on the cam selection.823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. This means that 823s offer and promote better overall performance in the vehicle's combustion chamber.862 vs 706 Heads. The Chevy 706 LS Heads are superior to the most popular 862 heads, sand cast, and produced using semi-permanent molds (SPM). ... Due to their better ports, 317 heads are frequently preferred over 243 and 799 heads, two more expensive models. However, the bigger 71.06cc combustion chambers of 317 heads will reduce …823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. This means that 823s offer and promote better overall performance in the vehicle's combustion chamber.BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. Generation III V8 cathedral intake port cylinder head. Casting 12564243. For truck, van, SUV and perfomance applications. Used on LS6, L33, L20, LH6, LY5, LMG, LC9,LS4, LH8, LS2, LFA, LZ1 engines. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It ...118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote.Good deal guys. but two different casting facilities. Makes one wonder, and the idea of a aftermarket ported or polished heads more important, The two different 243 heads, one with the triangle sand cast mark and the 243 head without the triangle sand cast mark were 5-7 hp and lb ft difference. Has any one flow bench tested the stock 799 heads ...The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, …Is 862 Heads Any Good? If you are asking, “Are 862 heads any good?” The 862 heads are pretty good because they can deliver better compression after a porting job. However, …05 LS2. I know the cam is .525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? I think you're limited to around .550 with the LS6 springs. A lot of guys go to 918 springs with mild camshafts like the GT2-3. Doing the math on a 1.8 rocker makes it .554 lift.The 862 Cylinder Heads. Features and Specifications. In contrast to the 243 heads, the 862 cylinder heads are typically made of cast iron, which makes them heavier but also more durable. They have smaller ports compared to the 243 heads, which can limit airflow to some extent.The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. That will determin what pushrod to go with. The stock heads should be something like 61.15 cc. The 799 heads should be 64.45. . 1994 SFBD extcab longbed 20/22 406sbc . Project thread.243, 853, 241 heads? Jump to Latest Follow 5K views 4 replies 5 participants last post by bladesofsteel Aug 6, 2010. runoveryou Discussion starter 249 posts · Joined 2008 Add to quote; Only show this user #1 · Aug 5, 2010. Do any of these stand out from the others in performance from a stock stand point? ...ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, …Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Than...I know 243's are good but didn't know if 862's are any good when they're right in front of me. They won't flow as good as 243 but you'll have better compression vs 243. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. They'll never be rock stars but they'll do fine with that cam.So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4.8?Jun 2011. Location. Clarksville, TN. Posts. 198. 862 heads for a 4.8L ? Got lucky at a local junkyard and snagged a set of 862 heads off a wrecked z71 2000-2006 body style. thinking about building these (port n polish, roller rockers, valves n springs to go with a nice cam) to put on my 06 gmc 4.8L .The heads with the casting flaw were the 706 castings made by castech from 2000-2005. The 862s are functional equivalents from the same years and were never suspect for cracks. Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5.3/4.8 had the casting notch. The notch disappears sometime in 2001 but nobody is sure.Intro to the LMG Engines. The LMG came in GM trucks and SUVs in 2007-'14 and made between 310-326 horsepower horsepower right out of the box. It's a Gen. 4 5.3L iron-block engine, so you're getting the better intake manifold, connecting rods, and ECM. The engine also had 799 or 243 casting heads which are closely related to the LS6.862 Vs 243 Heads . One of the first things that you need to consider when building a performance engine is what heads to use. There are many different options on the market, but two of the most popular choices are 862 castings and 243 castings. So, which one is better? The 862 heads were originally designed for high performance applications.In a comparison of the cammed 243 head and the cammed rectangle-port LS3 head, the LS3 torque peaks at 456 lb-ft (4,800 rpm) while the 243 head madeat leastthat much torque from 3,500 rpm all the ... 862 vs 706 Heads. The Chevy 706 LS Heads are superior to the most popular 862 heads