862 vs 243 heads

Jun 13, 2022 · Which heads are better 706 vs 862? Sometimes the difference between the 706 and 862 heads is negligible, but there are a few notable distinctions. The 862 heads are sand cast, while the 706 heads use a semi-permanent molding process. Additionally, the combustion chambers of the 862 heads are smaller than those of their predecessors - this ...

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: 1.57.53 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.Jan 5, 2023 · The 243 vs. The 799 Cylinder Head. As you have most likely caught on by now, these two cylinder heads are practically the same. The main difference between the 243 and 799 cylinder heads is that the 243 was used on older engines from GM Research, while the 799 has been used on newer engines from multiple manufacturers.In the world of automotive engines, the choice of cylinder heads can significantly impact your vehicle's performance. Two popular options that have gained a lot of attention are the 862 and 317 heads. Each has its strengths and weaknesses, and understanding the differences between them is crucial for making an informed decision. …The all new PRC aftermarket casting LS3 heads are the perfect option for customers looking for the ultimate in LS3/L99/L92 cylinder head technology. The 13-degree valve angle will allow for the ability to run more compression and larger camshafts thanks to additional piston-to-valve clearance!! Lift. Intake Flow.

The factory-built motor dished out about 430 horsepower right out of the gate, and the cylinder heads play no small role in that impressive output. The LS3 heads hit the flow bench. The LS3's 319-T5 aluminum alloy cylinder heads use 2.165 in (55.0 mm) intake valves, 1.59 in (40 mm) exhaust valves, and a 15 degree valve angle.I wonder if the Edelbrock head was an LS1 or a 5.3L specific head. The bore difference of the LS6 to the 5.3 liter motors is 99mm vs 96.01. 3mm diameter is only 1.5mm smaller from the wall to the valve. I know it will shorud but the test showed it worked. The engine ran on an engine dyno and ran well.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 …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 ...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 ...Nov 12, 2017 · 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.The LS 243 Cathedral Port cylinder heads are renowned for their exceptional performance capabilities over the other cathedral port offerings. These heads are designed to maximize airflow and combustion efficiency, taking advantage of the LS6 engine's power potential. With their cathedral port design, larger valves, and improved airflow ...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.

Advertisement During a normal night of sleep, your body slowly shuts down and becomes somewhat paralyzed (a good thing, so we don't act out our dreams). In the transition from wake...If so, the 862 has a tiny 1.9 intake valve. The 317 head has 2.0 valve and a larger intake runner cc, like the LS6. The 862 in a good bench make 220ish cfm, 317s as much as 257 or so. Just has a larger combustion chamber.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 ...I have GM MLS head gaskets with a 0.051" compressed height and am planning for 0.010" out of block for a 0.041" quench. This should net me a compression ratio of 11.16:1. ... LS3 aluminum block (4.070" bore), 3.622" stroke, 243 64cc heads, flat tops with -3.2cc valve reliefs, 0.051" GM MLS head gaskets. combo will use a 228r cam, ported 243's ...

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The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM ... these are basically 243 heads; See All 5 Photos. Vital Specs for 706 ...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.87LC2. This is rarely brought up, but the combustion chamber design of the L92/Ls3 heads is superior to the 241/243 chambers. The cathedral heads use a "heart" shaped chamber where the square port heads use a "butterfly" shape. The butterfly design is said to improve tumble, swirl, flow, flame propagation, everything.The primary benefit of porting and polishing 243 heads is improved airflow. This allows for better combustion, resulting in increased horsepower and torque. Additionally, porting and polishing can lead to improved fuel efficiency, as the engine is able to more effectively use the fuel it receives. If you’re looking to improve the overall ...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!lt1z. 30920 posts · Joined 2007. #6 · Mar 12, 2015 (Edited) A 317 head on an LS2 will be 10.0:1. A 243 on a LQ9 will be 10.9:1. Only major difference is combustion chamber cc. I would not go with less then 10.0:1 compression on a 2300. Mill a set of 317s to 70cc, run an LS9 gasket and head studs. C6 M6 Vortech 857/725.

There is a part number 12558060 Vortec cylinder head assembly sold by GMPP that is made from the casting number 12529093 head. The info above about the L30 5.0L c/n 059 Vortec heads having the "same but smaller" ports is incorrect. The 059 head has a swirl vane cast into the port.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)Jul 16, 2007 · 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.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 ...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.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 ...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.One popular option for 383 strokers is aluminum heads. They offer several benefits, such as being lightweight. This results in reduced overall weight, which enhances performance. Additionally, aluminum dissipates heat well, allowing the engine to run cooler.Pros And Cons Of Doing A 243/799 Cylinder Head Swap On The LM7, DESCRIPTION: GM GMC Chevy V8 This listing is for the Brand GM GMC 706 castings Reinforced casting makes this. Home; Home › 799 heads on compression › ... 862 Heads Max Milling Forums. DESCRIPTION: GM GMC Chevy V8 This listing is for the Brand GM GMC 706 castings Reinforced ...Locate 243 Heads on sale below with the biggest variety of 243 Heads anywhere online. Skip to content . HQ Automotive Service & Parts. ... Gm Ls 706 806 862 241 799 862 243 Cylinder Head Rebuild Service 3 Buisness Day. $459.99. View Details. 08-14 Bmw 550i 750i X5 X6 F01 E70 F10 E71 4.4l Twin Turbo Right Cylinder Head. $237.00.3712 posts · Joined 2009. #6 · Dec 4, 2009. batboy said: Think you are mixing up your facts. It's like a 25 HP gain by swapping in casting 243 (LS6/LS2) heads on a LS1. The LS2 already has the same casting heads. The only difference in the LS6 heads vs. LS2 heads are the light weight sodium filled valves.If so, the 862 has a tiny 1.9 intake valve. The 317 head has 2.0 valve and a larger intake runner cc, like the LS6. The 862 in a good bench make 220ish cfm, 317s as much as 257 or so. Just has a larger combustion chamber.

Trick flow 228/230, K&N CAI, Beehive Springs,Hardened 7.4 length Push rods,Spintech Catback Exhaust. The rest of the car has stock manifolds,stock intake,stock cats,stock 241 heads. I pass smog and put 365 to the wheels and 352 pounds of torque. I have a simple set up and I will be installing AI 243 heads and shorty Headers with in this month.

Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches Stock Head Flow Numbers51 posts · Joined 2011. #1 · Feb 22, 2012. Are the 5.7L 243 Casting Number Cylinder heads Direct Bolt on for a 4.8/5.3? StrokerAce03;5114860 said: Basically its just a bastardization of parts to create an oversquare engine that should scream at high rpm and rev to the moon. BE DIFFERENT.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!I have 862 heads on the 5.3 should I go with bigger intake valves for turbo application or will it make much of a difference? I have 862 heads on the 5.3 should I... - Glockner Oil RacingReceived 26 Likes on 26 Posts. I took my 243 heads and had them cleaned up ( polished ) cleaned up ruff edges, but not ported. Had them milled to about a 62-61.5 cc chamber or something like that. run a 224/224 581/581 112+4 comp cam. comp 918 springs, comp rockers. Smith brother push rods.10 Apr 2018 ... Comments10 ; Comparing Stock LS Heads with Flow Numbers. Eric Weingartner · 16K views ; LET'S TALK TECH-243 VS 862. Richard Holdener · 119K views.3712 posts · Joined 2009. #6 · Dec 4, 2009. batboy said: Think you are mixing up your facts. It's like a 25 HP gain by swapping in casting 243 (LS6/LS2) heads on a LS1. The LS2 already has the same casting heads. The only difference in the LS6 heads vs. LS2 heads are the light weight sodium filled valves.GM 4.8 5.3 5.7 6.0 OHV Cylinder Head Casting # 799 / 243 "LS" V8 Chevy Silverado GMC Sierra 2001 - 2017. Chevy 4.8 / 5.3 OHV Cylinder Head Silverado GM "LS" Casting # 862 GMC Sierra 1999 - 2007. ... **NO CAM SEALS HAVE BEEN INSTALLED ON ANY OF OUR HEADS**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? ...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 heads

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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.According to a post on their forum from Tim@Lingenfelter, L86 LT1 General Motors Cylinder Head Runner Volumes and Chamber Volumes. The factory L86 LT1 cylinder heads runner volumes and chamber sizes are as follows. Stock L86 LT1 cylinder heads -. 297 CC intake runner volume / 107 cc exhaust , 56.5 cc chambers.American Airlines is reinforcing its position at the top of the pack in Hilton Head, South Carolina, with new flights to Chicago, Dallas/Fort Worth and Philadelphia next spring. Am...According to a post on their forum from Tim@Lingenfelter, L86 LT1 General Motors Cylinder Head Runner Volumes and Chamber Volumes. The factory L86 LT1 cylinder heads runner volumes and chamber sizes are as follows. Stock L86 LT1 cylinder heads -. 297 CC intake runner volume / 107 cc exhaust , 56.5 cc chambers.The 243 heads were utilized in the LS6 engines manufactured between 2001 and 2006. These heads are known for their exceptional power and efficiency. ... Recommended: 862 Cylinder Heads - A Detailed Overview. What LS comes with 317 heads? LQ4 engines got Generation III 317 V8 head in 2001. It has cathedral-like intake ports and a D-shaped exhaust.Casting number 862 or 706 heads were used and sported a 61cc chamber but had tiny 1.890 intake valves. The stock heads can be CNC-ported for more airflow and milled up to .030 inch for more compression. Flow numbers can be as high as 325 cfm at .600-inch lift. Lightweight, hollow-stem LS3 valves can be cut to 2.040 inches to fit the …Jul 10, 2022 · You are much better off with the 706/862 heads from a compression standpoint. Also, the port velocity on the 706/862 head is much better than the 799/243, which will help you with the small bore of the 5.3. The 706/862 respond very well to a light runner cleanup and a good multi angle valve cut.The 243 heads are a type of LS cylinder heads that were originally used in the 2001-2004 LS6 engine. These heads are known for their high-flow intake and exhaust ports, which allow for improved performance and efficiency. Today, 243 heads are a popular choice for those looking to upgrade their LS engine's performance. ….

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.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.862 is a 5.3 liter head. Smaller combustion chamber (61.5CC), increased CR. 241 is a 5.7 liter head. Larger combustion chamber. Gains from a higher ration rocker arm (1.8 vs 1.7) are going to be minimal. Expect approximately 10 peak HP. IMO, if you have any plans of adding a aftermarket camshaft later down the road, pass on the 1.8 ratio rockers.The engine also had 799 or 243 casting heads which are closely related to the LS6. The engine has flex-fuel capability. In 2010, the LC9 gained VVT as well as pistons with valve reliefs, and compression dropped from 9.9 to 9.6:1. … For LC9 engine specs, read this: LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs ...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 ...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.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 ...Pretty good snowstorm today. I did the Caddy lifters at the suggestion of Ryan at GPI along with some LS3 intake valves. The hollow LS3 valves were significantly lighter than L92 valves. If I remember correctly it was something like 89g for the LS3 valves and 123g for the L92s. Lets Go Brandon! 862 vs 243 heads, 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 Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped..., 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 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 ..., 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..., 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 ..., GM 706/862 5.3-Liter LS1, 218 cc. GM 243 (LS6) and 799 (LS2), 218 cc. GM 243 (LS6) and 799 (LS2), 226 cc. While not the largest name in the industry, AI is well respected. This North Carolina-based shop is practically a factory for CNC head porting, with programs for the Gen II, III, and IV small-block only., I knew the flow was the same just didn't realize gm put the 243's on the 5.3's. I better look at the driver side because I remember GTO's and vettes with 1 - 799 head and 1 - 243 head on the other side. My LS6 has 10.5:1 with 243's and I love it. The 09' has great response also eventhough I haven't tuned it yet. 97 GMC, 2002 LS6., 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., The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. The LS6 cam is the most aggressive cam GM put out for cathedral port headed ..., To help your comparison a little more, the ported 241 castings flow a max of about 295-300 CFM and are 215 CC's after porting. The ported 243's flow a max of 315-320 CFM and are 225 CC's after porting. In our experience, apples to apples the ported 243's are worth about 20 RWHP over ported 241's (with a similar torque curve down low)., Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches., 862 heads: These are also compatible with 5.3 engines, similar to 706 heads. However, they offer slightly less power potential. 243 heads: A popular choice for LS enthusiasts, they provide higher power gains when matched with the right cam. Cam swapping with 5.3 engines typically benefits from using LS3-type springs. These springs improve valve ..., The 243 heads were utilized in the LS6 engines manufactured between 2001 and 2006. These heads are known for their exceptional power and efficiency. ... Recommended: 862 Cylinder Heads - A Detailed Overview. What LS comes with 317 heads? LQ4 engines got Generation III 317 V8 head in 2001. It has cathedral-like intake ports and a D-shaped exhaust., 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. so can anyone guesstimate/ give me factual data on what i would pick up just swapping stock ..., It was the 243 casting, but I don't think there is a big difference in potential. It made good power for a pump gas street engine. Had 10.7/1 comp, 243/258/110 comp cam with .625" ish lift. sv intake, 243 heads ported reasonably well with 2.02" 1.56" valves 50* seats, whitener 4150 carb. Pump gas pulls were the best on tq vs av gas but same hp., PRC As-Cast 225cc LS1/LS2 Cathedral Heads - Big Chamber $ 2,203.19. PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads $ 2,709.99. PRC LS7x 265cc CNC Heads $ 3,935.99. PRC LS7x 285cc CNC Ported 400 CFM Heads $ 3,935.99. Precision Race Components Aftermarket LS3 As-Cast Cylinder Heads $ 2,101.19., 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.., Posted March 1, 2011. On 2/28/2011 at 11:24 AM, Krambo said: Well, 243's are a good way to increase compression. With a stock 64cc combustion chamber on the 243's and your LQ4, your looking at about 10.5:1 SCR vs roughly 9.4:1SCR with the stock 71cc 317's...gasket dependent. The bump in compression will be nice along with the better designed ..., The 243 head is the 01+ LS6/LS2 head. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports. ... 5.3 truck heads (casting #862 and 706) are also a very popular base casting for porting/modifying, due to their even smaller (61.15cc) chamber size which raises compression when ..., 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 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 ..., Quote: Originally Posted by lil john. True Tuskyz, also the 821's have less meat, *Some porters don't like to go over 270'cc while the the 823's are good to around 280'cc. Phil @ Advanced Inductions gave me a quote on the 280cc version on my #821 heads. Reply Like. 08-12-2016, 09:11 AM., GM never made an iron LS1. Look at the front of the block and it will clearly have the displacement cast into it. If it is a 5.3, slap some 243's on it and a punchy mid range cam in it and it'll be a good street brawler. If it is a 4.8, some aftermarket heads with revised valve angles and dual valvesprings (TF Gen X 205 for example) and a cam ..., link to camhttps://www.summitracing.com/parts/btc-trucknorrisLink to valve springs https://www.summitracing.com/parts/SUM-174002cam retainerhttps://www.summ..., In any event, although the dyno did not show a huge gain, the SOP feel with the heads is serious. The Goat pulls much, much harder, especially above 2600 rpms or so. Ron at Vengeance told me that the as cast typically dyno about 10-12 HP less than the CNCs. 2018 Camaro ZL1 1LE: 649 HP 689 Trq., 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., Brawler LS6 Style CNC Ported Cylinder Heads w/ TSP .660" Spring Kit and Titanium Retainers $ 1,835.99. PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads $ 2,709.99. Precision Race Components Aftermarket LS3 As-Cast Cylinder Heads $ 2,101.19. Precision Race Components 2014 5.3L & 6.2L CNC Porting Service, 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. so can anyone guesstimate/ give me factual data on what i would pick up just swapping stock ..., 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., 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., 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 ..., 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 heads