862 vs 243 heads

45 posts · Joined 2006. #4 · Apr 12, 2010. I'll recommend TFS 215 heads and a 224/228 comp cam. A friend of mine has this package and I was really impressed. With a ported fast he made 450 rwhp and the car idled and drove great. It was actually a little tame for my taste, but sounds like what you're looking for.

Here is what it was: -283 bored .060" over to 292. -gm turbo heads fully fully ported. -11.8:1 duffys custome forged pistons. -solid roller cam 276/280 @.050 .670/.630 108* lobe seperation {in an auto or these days it would be a 104-106* lobe center} -edelbrock tunnel ram.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.1 Jun 2020 ... WHO WINS? FULL AIRFLOW & DYNO RESULTS-ULTIMATE LS HEAD TEST. 11 SETS OF LS CATHEDRAL HEADS. How much hp can stock LS1 heads make?Realistic Capabilities of LC9 5.3. Ill go on and say im very, very inexperienced with LS stuff. I just snagged a 08 LC9 aluminum block 5.3 for dirt cheap. It has a bad crank (spun rod bearing), 243 heads, truck manifold.Head gasket repair can be an expensive, but necessary repair for your vehicle. Knowing the average cost of a head gasket repair can help you budget and plan for this important main...821's and 5364's are identical as a bare head. You can swap them without a difference. The only difference is the 821's can be a LS3 head and have the lighter intake valves and yellow valve springs but still them same head and flow. The only time you are going to see a performance difference is when there is a casting shift that affects the ...The 241 castings feature 205cc intake ports, 70cc exhaust ports, and a 2.0/1.55 valve combination. The hot factory heads would be the LS6 (243 castings), but even the stock LS1 heads can be made ...TEA stage 2 862's or 243's? Jump to Latest Follow 21 - 35 of 35 Posts. 1 ...

Sniper's Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Founded by Frank Galli in 2000, Sniper's Hide has been offering informational videos, podcasts, and other support to its users in one location. Forum Statistics. Threads. 474,737.1518 posts · Joined 2009. #7 · May 3, 2010. I just got my quote from AI for their full 226cc CNC work and the price can not be beat. With shipping back from them the price is just a bit over $1,000. They also have a budget pricing port job as well but yields about 10rwhp lower.Which factory LS cylinder head works best with a turbo, 706 or 317? It's the age-old comparison, airflow vs compression. This LS head shoot out between the s...Feb 18, 2024 · 706 heads tend to be more popular than 243 heads with those who run naturally aspirated engines. While they don’t have the same size combustion chamber they also don’t have the tendency to lower the compression ratio and reduce horsepower. When looking to replace your heads, they offer a high degree of consistency since they are ...Here’s my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn’t I have a better head with more compression and that’s not counting if I ...Incidentally, 799 heads are essentially identical to 243 heads, but the 243 casting has a smoother finish. 823 vs 706 heads. Similar to the 799s, the 706 will deliver better performance up to around 4000rpm. However, for racers willing to spend a little more money, the 823 LS3 cylinder heads are fantastic all-rounders. The Final Verdict

Head and face reconstruction is surgery to repair or reshape deformities of the head and face (craniofacial). Head and face reconstruction is surgery to repair or reshape deformiti...The 243 Heads are cast iron cylinder heads that have been CNC-machined to create larger intake and exhaust ports. The combustion chambers have also been machined to be smaller, which increases the compression ratio. While the 243 heads are not the newest or best option out there, they offer a great value for the price.2005 GTO QSM, 418" NaturallyAspirated ,Bullet Racing cam, 243 heads, 6speed, Kooks 1-3/4" headers w/cats ,matchported FAST 102,NW 102mm, 3.73 gears PB in 1/8th 7.76@97 on Firestones with 1.97 60'. Tick Performance tuned.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. teauran_0 (529) 100%. Free shipping. 7 watchers. Chevy 4.8 / 5.3 OHV Cylinder Head Pair 862 Silverado GMC Sierra Vortec 99-07.

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Last Updated on Aug 16, 2023 By Paul Lucas. There are three main differences between 241 and 243 heads. The first is the size of the combustion chamber, the 241 has a 67 cc, and the 243 has a 65 cc. The second is the port shapes. The 241’s oval-shaped port has a 200 cfm intake, and the port on the 243 is D-shaped and offers better flow.15 Apr 2018 ... LET'S TALK TECH-243 VS 862. Richard Holdener · 117K views ; Hand porting 706 5.3 heads. Drivin with Drew · 19K views ; How to port your LS cylinde...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.....Both of the cylinder heads possess the same valve size. Additionally, they have ports and chamber cores of the same size. The actual difference lies within the compression ratio of the two. 862 heads are cast on sand molds, but 706 cylinder heads are cast on a semi-permanent mold. 862 heads also fit into smaller combustion chambers as compared ...

My 2007 came with 243 heads stock. the 862's are off the early 4.8-5.3 motors after about 99 I believe. I also believe texas speed used to have the 2.05 valve opton on those heads at one time. I run 2.04 valves on mine. 12-30-2010, 08:54 AM #7.#1 · Oct 25, 2012. cammed 6.0. stock 862 (5.3) heads and compression at 10.5:1 or. stock 317 (6.0) heads and compression at 9.5:1. the Capitalist Creed - From each according to …3012 posts · Joined 2008. #1 · Apr 14, 2012. I have a 2004 Aluminum 5.3 with 70k miles that has 862 heads on it. I also have a set of 243 heads off of a 2009 Aluminum 5.3. Which heads should I use? I've been told the 243's flow better and the 862's supposedly raise compression .5 a point.Dec 3, 2013 · 4135 posts · Joined 2010. #3 · Dec 4, 2013. I know you are on a budget, but once you clean, do a valve job and mill those 243s, you will have some cash in them. You could sell them for $400 or so, get a set of Stage 1 LS6 CNC ported heads for around $1200. I just think that is fantastic bang for the buck.May 7, 2023 · 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.DESCRIPTION Professionally rebuilt 5.3 Chevrolet / GM cylinder heads. These cylinder head's casting numbers are: 243 ONLY! THESE HEADS ARE THE SOUGHT AFTER 243 CASTING NUMBERS ONLY THIS IS FOR A PAIR HEADS! DETAILS Heads are thoroughly cleaned and inspected Pressure tested to ensure no cracks or leaks Guide work performed / replaced with new guides as necessary Valve job / performed on Serdi ...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 guy I brought my L33 from had changed the 799 heads out for 862 to bump up the compression. Unfortunately he didn't still have the 799's. I kinda like the bump in compression but the 1.89 exhaust valve sucks. I've seen where guys have upgraded the valve to a 2.00 and with a little porting work out flowed the 243/799 heads by a fair ...The combustion chamber diameters can play a big role in hindering flow and performance. The 706/862 combustion chamber diameter measures out at around 3.670" and the 243/799 combustion chamber messages out at around 3.880” and giving the fact that the LM7 5.3L engine bore is 3.780" this more than likely has something to do with the power loss ...The factory LS3 intake manifold is much better than even the coveted LS6 so that alone almost makes the swap to 821/823 heads worth it. We recently dyno'd a stock cube LS3 with Fitech controlling it on 91 pump gas. It made 595 with .030" taken off the heads, CNC porting done by Mission Critical and a 240/243, .605/.610 cam with a 113 LSA.

Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...

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 ...and with this info it seems that the 241s would have slighly larger valves than the 706s so that may help. 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.On our Mast heads, the LS3 head offered both more intake and exhaust flow than the cathedral-port heads, resulting in an intake-to-exhaust flow percentage (372/261 cfm) of 69.89 (meaning the ...15 Apr 2018 ... LET'S TALK TECH-243 VS 862. Richard Holdener · 117K views ; Hand porting 706 5.3 heads. Drivin with Drew · 19K views ; How to port your LS cylinde...Which factory LS cylinder head works best with a turbo, 706 or 317? It's the age-old comparison, airflow vs compression. This LS head shoot out between the s...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 …The outer planets Jupiter, Saturn, Uranus and Neptune all have shorter days than Earth. Among the terrestrial planets, Mars has a slightly longer day than Earth at 24 hours 37 minu...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 performance ...1518 posts · Joined 2009. #7 · May 3, 2010. I just got my quote from AI for their full 226cc CNC work and the price can not be beat. With shipping back from them the price is just a bit over $1,000. They also have a budget pricing port job as well but yields about 10rwhp lower.

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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 ...No 243s or 799 have the casting defect that I've heard, it was pretty isolated to the castech only 706's on gen III 4.8/5.3's. There are 2 other sets of 706's that are not affected. The early sand cast heads come as 862s and 706's, and a die cast 706 that isn't made by castech. 16 posts.CI 6-7-8-9-10 Veteran. St. Jude Donor '03. Yes, the 243 and 799 heads are now being used on later model (05+) 4.8 and 5.3 truck engines. Reason being is they changed from dished to (now) flat top pistons in those engines, which required the larger head chamber to keep compression ratio about the same.Apr 26, 2018 · Something to keep in mind is the 2004 and later engines (even Gen. 3) had two head bolt lengths vs. three on the earlier engines. (Information for this article originally appeared in this Upgrading the Gen. 3 5.3L, Aluminum Block, LS Truck Engine article at Summit Racing’s searchable database of FAQ tech info .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 …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 ...which stock ls head makes the most power? should i upgrade my stock 6.0l heads? do cathedral-port heads make more torque than a rec-port heads? what about th...Heads/Cam/Intake Manifold/Internals ...link to camhttps://www.summitracing.com/parts/btc-trucknorrisLink to valve springs https://www.summitracing.com/parts/SUM-174002cam retainerhttps://www.summ... ….

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. It was even better with 4.10s but had no trouble with the 3.42s. It put down around 450 at the wheels too. You could meet your HP goals with a bone stock LQ4 and a TQv2 no problem and still drive great.LS Heads: Cathedral-Port vs. Square-Port Heads. Time to eliminate the speculation with some facts from the dyno. Richard Holdener Writer Jul 09, 2012. See All 14 Photos. ... 243. 191. 318. 216 ...An improved version of the stock LS7 cylinder heads, the LSX-LS7 heads feature a 12-degree valve angle, giant 2.200/1.610-inch valves, 270-cc as-cast ports, and six-bolt-per-cylinder bolt pattern for use on aftermarket blocks. The upper echelon of GMPP's aftermarket cylinder heads is an evolution of the C5R castings.Remember, 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 ...The 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.The 862 heads are pretty good because they can deliver better compression after a porting job. However, the cylinder heads may not flow well compared to 243 heads. Also, 706 heads are considered to be superior to 826 cylinder heads. 826 cylinder heads are not as sophisticated as some of their counterparts.Mar 13, 2018 · Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...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 ... 862 vs 243 heads, hivoltagedriver. Port and polish on a set of 243's is usually ~20hp. A set of ported 243's on your LS1 should make a sizable difference, especially with a cam. '09 PSM G8 GT w/ Premium & Sport packages. Go: Kooks 1 7/8" LTs, catless mids, Corsa, VCM OTRCAI, Rick C. AirRam intake and ported TB, tuned by me., 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!, ForceFed86 said: ... untouched 862's should support 437chp in an HP range of 6300-7800 @ 292 cubic inches. Seems like a lot. I'm not aware of any small valve 4.8 NA head setups doing anywhere near that on untouched heads. That's only ~1.5hp/ci, which isn't unreasonable for a mild pump gas engine., 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, depending on your car’s needs and …, These large-runner heads have a 12-degree valve angle, like stock, and are compatible with factory LS7 rocker arms and stands. The heads can accommodate 1.625-inch-diameter springs, and several are available. A 4.125-inch-or-larger bore is required. Base price is $1,130 each, fully assembled, through Summit Racing., The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the modified LS3 combination produced 552 hp at 6,400 rpm and 513 ft-lbs of torque at 5,000 rpm. After installation of the TFS Gen X 255 heads, the power numbers jumped to 571 hp at 6,500 rpm and 525 ft-lbs of torque at 5,200 rpm., 823 vs 243 heads The popular L6 243 heads have a smaller capacity (64cc), whereas the 823’s larger intake valve has a 70cc cylinder, promoting better overall flow within the combustion chamber. In addition, there’s some controversy among gearheads about whether the “swirl” ramp added to the 243 to improve fuel and air mix in the ..., 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 ..., s10xtremist Discussion starter. 7846 posts · Joined 2006. #10 · Dec 26, 2012. Iroc-10 said: They ran the yellow springs on most of the 243/799 heads, because in the end, they ran them on the GTO, and TBSS, as well as the higher HP 5.3. Looks like sodium exhaust valves are about 65 grams and the intakes are 74 grams., I recently jailbroke my iPhone and now that it's done I'm very overwhelmed by Cydia. I've downloaded a couple apps, but I don't understand most of what I'm looking at. The descript..., 243 Heads. Thread starter Tonyrodz; Start date Apr 25, 2017; ... Not looking to swap out for a stock casting head. He also has a motor, 4.8 actually, that has the 862 heads on them. Same as mine. He's gonna scrap that motor, which sux. Apr 25, 2017 #7 iamdub Full Access Member. Joined Apr 23, 2016 Posts 20,787 Reaction score, 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..., The biggest difference between the Stage 1 and the Stage 2 is the use of larger Ferrea valves and accompanying valve job, which was developed on the Trick Flow Specialties (TFS) 215-cc head. Just like the Stage 1, the 243 or 799 casting receives full CNC porting of the runners and hand blending of the port and valve job., 6.0L (LQ4 and LQ9): Upgrading these larger engines with 706, 862, or 243 heads requires a single-pattern cam to optimize power gains. Cam specs play a vital role in compatibility as well. For example, a single-pattern cam with 224 duration and 112 LSA works best with mildly ported 706 heads. Comparative Table. Engine 706 Heads 862 …, 933: Found on 1997 LS1 engines up to mid-September. Although 862 and 706 heads share many similarities, the primary difference is that the 706 heads are made using SPM (semi-permanent mold) while the 862 heads are not. This makes the 706 heads slightly superior. Cylinder Head., Buy GM LS2 LS6 Gen III Gen IV SET OF 2 Remanufactured Cylinder Heads 243 Assembly w/Rocker Arms OEM REMANUFACTURED (Renewed): ... GM 4.8L 5.3L LS REMANUFACTURED Cylinder Head 862 Assembly w/Rocker Arms 706. Add to Cart . Add to Cart . Add to Cart . Add to Cart . Customer Rating: 4.2 out of 5 stars: 3.2 out of 5 stars: 2.8 out of 5 stars:, 243 heads are known for their larger port and valve sizes, which are typically about 210cc and 2.00 inches respectively. This makes them perfect for high-flow, high-RPM applications, providing more power at higher speeds. On the other hand, the 799 heads have smaller port and valve sizes, around 200cc and 1.89 inches respectively., 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., In its latest form, the LS3 has followed the 5.7L LS1/LS6 and 6.0L LS2 engine configurations by starting with an increase in displacement, checking in at 6.2 liters. This came courtesy of an ..., Are you looking for a new shaver head for your Norelco electric razor? If so, you’ve come to the right place. In this article, we’ll provide you with all the information you need t..., The heads on it right now are 862's. ... If you can get the 317 heads for a good deal you should be able to make more power at the same psi if they are ported good . ... ^^^ This ir run down some ported 243/799s would be good. You can usually run across some ported 243s for a decent price., Incidentally, 799 heads are essentially identical to 243 heads, but the 243 casting has a smoother finish. 823 vs 706 heads. Similar to the 799s, the 706 will deliver better performance up to around 4000rpm. However, for racers willing to spend a little more money, the 823 LS3 cylinder heads are fantastic all-rounders. The Final Verdict, 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 ..., GM LS6 (243 casting). Information needed…, The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the modified LS3 combination produced 552 hp at 6,400 rpm and 513 ft-lbs of torque at 5,000 rpm. After installation of the TFS Gen X 255 heads, the power numbers jumped to 571 hp at 6,500 rpm and 525 ft-lbs of torque at 5,200 rpm., I flow a stock 706, 862, and 317 LS Head and share the numbers., 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 ..., Vehicle enthusiasts argue about 243 heads Vs. 799, as well as 243 heads Vs. 862 heads . However, if you desire improved horsepower with excellent power output, the 243-cylinder head is a perfect choice., #1 · Dec 3, 2013. i want to know if I would pick up anything swapping in STOCK 243s heads in place of stock 862 truck heads that i am currently running. i recently put a bigger cam in the car and picked up zilch.zero.nada and im wondering if im at the limit of the 862s., 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!, Here’s a quick data sheet on the specs of 799 heads. Due to the similarity, 243 heads should follow the same characteristics in normal situations: Combustion chamber volume: 64.45cc. Intake port volume: 210cc (sometimes seen as 209cc too) Exhaust port volume: 75cc. Intake valve diameter: 2.00 inches., the 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!, which stock ls head makes the most power? should i upgrade my stock 6.0l heads? do cathedral-port heads make more torque than a rec-port heads? what about th...