Upgrading LM7 Cylinder Heads. The stock heads can be CNC ported for more airflow and milled up to .030 in. for more compression. Flow numbers can be as high as 325 cfm at .600 lift. Lightweight hollow stem LS3 valves can be cut to 2.000 in. to fit the seats. Between the light valves and better springs, the engines will pull cleanly to 7000 rpm.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 headsRemember, not all 243 heads are LS6 heads, but all LS6 heads are 243 castings. True LS6 heads will have the stainless steel hollow-stem valves. ... 373/873 LQ4 iron heads - 71.06cc. 706/852/862 ...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...The 243 is an excellent head and has a huge potential----They can port them to around 220 cc's on the intake and about 80cc's on the exhaust (stock exh is 75cc) With the left over $$ savings you can buy. 1. Underdrive crank pulley ( an honest 8-10 RWHP across the ENTIRE RPM range) 2. Better X=pipe 5-7 RWHP.821/823 castings. im going to order ls3 heads but i would like to know the difference between 821/823 castings,i thought i read somewhere they were cast using a different process or something to that effect ,so which is better ls3 or l92 or is there no difference besides the map sensor. IBM 04/A4, #243 heads, Mild Blower cam by Comp (216/228 ...Upgrade your LS1 or LS6 engine with our Remanufactured CNC Ported 243/799 Cylinder Heads with .650 Springs and 2.02/1.59 Valves. These high-performance heads, designed by Chevrolet, are meticulously remanufactured to exceed OEM specifications, ensuring top-notch quality. These CNC Ported LS heads, part number ALL-65056PC, fit engines within the ...It is way too small for an LQ4 IMO. I would do a set of ported 243 heads from either AI, TEA or TSP in that order. For a cam I would look at something like the TSP TQv2 or MS3. My cousin had an LQ4 with patriot ported 243 heads and an MS3 and it drove great behind a T56 with stock 3.42 gears.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 ...LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's.Our 706 & 862 ported heads include: Our in house CNC port. PCD surfaced to your desired chamber size. Proprietary competition valve job. Hand blended valve job. ***This is our most common setup, but if this doesn’t meet your needs please call us so we can get you set up to your needs***. Intake valve: 2.02 Exhaust: 1.57.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 ...Get ready to feel the G-forces as we navigate the exhilarating terrain of power and performance. 862 LS Heads aren’t just components; they’re the driving force behind an automotive revolution, and the journey has only just begun! DIY Adventure: Installing 862 LS Heads Like a Pro. Time to get hands-on, gearheads!Although the SPM approach is more reliable, porting 862 heads eliminates their distinction. However, porting is expensive; therefore, casting 706 heads in stock form is the best option. 706 Heads vs 317 Heads. Due to their better ports, 317 heads are frequently preferred over 243 and 799 heads, two more expensive modelsThe 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft …My car is an ls2 of course, but with stock injectors, fuel pump, and stock catback exhaust, and with stage 2 ported intake, tb,hpe 243 heads, megadeath cam, and slp underdrive pulley with lpe cai did 450 rwhp. The injectors were at 124 percent duty cycle, and we were losing fuel pressure above 6300 rpm.Football Heads is a free browser mini-game. To be more precise, it's a series of games. The vast majority of games in this series are real international or national championships. Each new football season, starting in 2014, includes new games in which the list of competing teams or clubs changes and the players' lineup.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 heads243 vs 823 combustion chamber. by quicksilver » Sun Jan 12, 2014 6:33 pm. If you are familiar with the 243 or "LS6" cylinder head, you know that the chamber has a quench pad behind the spark plug thats relatively straight and the combustion chamber size is roughly 64cc's which for the combination I have already built, produced 10.2:1 ...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.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 4.8?PN: TEA-OEMLS2ST2-CUSTOM. GM Factory LS-2/LS-6 Stage 2 PortingOur most powerful CNC ported factory casting for the LS-1 Engines, the Stage 2. Designed using the same 2.04 and 1.57 valves and valve job technology developed and used in the TrickFlow 215cc head this head has awesome mid-lift airflow. It performs on par with most aftermarket heads.When it comes to the GM's LM7 engines, the 862 cylinder heads are an integral part. Constructed from lightweight aluminum material, these cylinder heads feature a 61cc combustion chamber volume for improved efficiency and performance. The intake port is shaped in a classic cathedral design while the exhaust port has an oval shape for better ...Milled 243 Heads Shorty Headers 18" MagnaFlow CAI Tube w/stock Air Box Bone555+6VEFCpe+2ZERO(02)6kRPMabuse.hpt Bone555+6VEFCpe+2ZERO(02)6kRPMabuse.hpt. 01-27-2018 #2. cobaltssoverbooster. View Profile View Forum Posts Senior Tuner Join Date Dec 2008 Location Nevada Posts 4,452.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 HEADMAKES MORE? We compared the four...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, …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.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.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 ...799 vs 862 heads which is better? I have a 99 5.3 that's going in my 02 silverado that currently has a 4.8 and the 5.3 has 862 heads and I found a set of 799 heads on a 5.3 in a savannah van and I was wondering what heads were better with a small cam and 75 hp shot of nitrous Reply With Quote. 10-04 ...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..The cc for the piston is entered as a positive number on a -cc Dish or Flat top piston and a negative number on a dome piston. This seems very confusing but it is because even though it is a -cc on the piston, those same cc's are gained in cylinder volume.Upgrading LM7 Cylinder Heads. The stock heads can be CNC ported for more airflow and milled up to .030 in. for more compression. Flow numbers can be as high as 325 cfm at .600 lift. Lightweight hollow stem LS3 valves can be cut to 2.000 in. to fit the seats. Between the light valves and better springs, the engines will pull cleanly to 7000 …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...Aug 6, 2020 · The 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless.The cheapest way is to have your 243 heads ported, probably less than $1000 without labor and tuning. Patriot heads are about $1300+/-. Most other aftermarket heads will be over $2000 for the heads alone. You can get a whole L92/L76 swap kit for about $2100. To get a Ls2/Ls6 head to flow what a L92/Ls3 head flows will take a lot of work, and ...Football Heads is a free browser mini-game. To be more precise, it's a series of games. The vast majority of games in this series are real international or national championships. Each new football season, starting in 2014, includes new games in which the list of competing teams or clubs changes and the players' lineup.We Step Up The Power With A 468ci Engine To Log The Performance Of Nine LS3 Rectangle-Port Heads. ... 243. 0.700 . 359 . 246. Like the offerings from Mast Motorsports, the Dr. J's CNC LS3 heads ...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 Armsthe 862 heads are off of a 2000 5.3 while the 706 heads are from a 2005. I am wondering in terms of flow,compression,ect I will be using them on a 5.3 . Save Share. ... I know 243 and 799 heads on 5.3 is a popular swap, but never thought about shrouding issues. Either way, still an improvment over the stock heads!The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft so ...Equipped with the 317 heads, the turbo 6.2L produced 807 hp at 6,800 rpm and 747 lb-ft of torque at 4,900 rpm. The boost pressure peaked at 7.6 psi, before dropping to 6.9 psi at 7,000 rpm. The ...The 806 heads are literally 1st gen heads, have a perimeter bolt pattern for the valve cover. Which means you need that cover and IIRC the coil packs bolt directly on the cover vs a bracket that holds the packs together. Flow is meh even when ported. You should look for 317 or 243/799 heads with the emphasis on the later for NA builds, if …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.However, the main distinguishing feature of the 862 cylinder head design is its unique ability to dramatically enhance air compression delivered following porting. While some may argue that the 243 heads are better, 862 heads deliver improved airflow, quality, performance, and power. Moreover, 862-cylinder heads are compatible with many cars.So how do 862 heads compare against the factory heads these engines come with? The 5.3L LM7 crate engine from GM trucks feature stock 243 heads. 243 …The 317 cylinder heads feature a distinctive intake port shape that resembles a cathedral and an exhaust port with a D-shape, coupled with a spacious combustion chamber that produces lower compression ratios. These heads are particularly suitable for turbo and supercharger applications and are compatible with 6.0L V8 LQ4 and LQ9 engine models.Find many great new & used options and get the best deals for Ls1 Stainless Steel Valve 2.02" Intake for 243 799 241 317 862 706 Performance at the best online prices at eBay! Free shipping for many products! ... item 1 GM 243 LS1 LS2 LS6 Gen 3/4 CYLINDER HEAD PAIR COMPLETE REBUILD NO CORE CHARGE GM 243 LS1 LS2 LS6 Gen 3/4 CYLINDER HEAD PAIR ...Which Stock LS Head Is Best For Building A Boosted Turbo LS Combo? 317, 799, 706, 241, 243, or 862? Feb 23, 2021 Chad Reynolds 1320 Engine Tech, 1320 Spotlight, Apex Engine Tech, Apex Spotlight, XL Engine Tech, XL Spotlight Comments Off on Which Stock LS Head Is Best For Building A Boosted Turbo LS Combo? 317, 799, 706, 241, 243, or 862?Also, all the heads have a new valve stem and can be replaced with new ones to ensure high-quality performance. All the 799 heads have a 3-year unlimited warranty. However, it is essential to ensure installation is done as per the manufacturer's instructions. Related Search - 243 heads: 243 heads specs that make it specialThe 317s slightly larger runners and valves won't give you 4%. So if we were talking NA, I would agree the 862 would make slightly more power than a 317. Once you add a turbo though everything changes. With that 1pt of compression drop you can add a good 5-7psi.This results in a slightly higher compression ratio using AFR heads. AFR: 56cc combustion chambers, smaller valves. Trick Flow: 58cc combustion chambers, larger valves. On smaller displacement engines, smaller valves and ports in AFR heads can provide better low-end torque source. The AFR 165, for example, is known for its good torque curve.Get the best deals for 862 heads at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. ... 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% when you buy more. Buy It Now.The cc for the piston is entered as a positive number on a -cc Dish or Flat top piston and a negative number on a dome piston. This seems very confusing but it is because even though it is a -cc on the piston, those same cc's are gained in cylinder volume.Showing the port work on my 862's setup for a small 4.8 build. Goal 375-425hp at the crankshaft prior to the Turd-Bo turbo install! 👍862 castings 20022.00/...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 heads243 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 heads