LET'S TALK TECH, ANYONE EVER SEE A SET OF STOCK 243 HEADS FLOW 270+ CFM? WE COMPARED 243 HEADS TO 862 HEADS, PORTED, …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 ...CNC ported GM 243/799 Castings Competition 5 Angle Valve Job 2.0" Intake & 1.55" Exhaust Valves 227cc intake runner, 84cc exhaust 62cc chambers Completely Assembled with our QCS Dual 660 Valve Springs w/ Titanium Retainers Laser Engraved QCS logo Sold in Pairs Lift Intake Flow Exhaust Flow .200" 148Advertisement Some say the power of aphrodisiacs is all in our heads. In other words, it's a placebo effect -- if we think something is going to put us in the mood for love, we'll ...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 ...Location: My own internal universe. Posts: 10,446. Likes: 134. Received 1,837 Likes on 1,145 Posts. 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.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.Bascially here are my options. 1. Keep 882 heads (already have crane springs), add an aluminum intake manifold ($140), 8" harmonic balancer ($60), new gasket set ($40). Total $200. 2. Buy a set of used Vortec Heads at the local junkyard ($210), Vortec intake manifold ($140), center bolt valve covers ($40), balancer & Gasket set ($100). Total $450.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.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.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)I did a 408 cube ls using a cathedral port head. 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.Oct 14, 2017 · I know stock vs stock the 243 is the superior head but my engine came with 706 non crack-tec heads and I'd like to use them if I could. My question is what performs better, a stock 243 or a professionally hand ported 862/706 because for the price of 243s I could have my 706s hand ported and flowed by a well known drag racer/engine builder in my area.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.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.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.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 ...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 ...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.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 ...More video to come. Put new heads and new cam in my 6.0 lq4 283 int/286 exh 114 LSA. More video to come. Put new heads and new cam in ...Mar 2, 2021 · 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 ...Thread: 317 Vs 243 Heads-need Help Choosing. Thread Tools. Show Printable Version; 10-06-2005, 12:51 PM #1. anthonycorvette. Guest 317 Vs 243 Heads-need Help Choosing I Have A 98 C5 With Stock Heads With A Lunatti Cam 221/221/558/558 W/112 Sep And Many Boltons. I Have Stock Heads Now And Have A Friend Who Has 317 Off A 2004 6.0 Litre For $300.When the LS 243 Cathedral Port cylinder heads are installed on an LS6 engine, the results are remarkable. The improved airflow, combustion efficiency, and larger valve sizes provided by the LS 243 heads contribute to increased horsepower, torque, and overall performance gains. Experience improved throttle response, heightened power delivery ...Oct 25, 2012 · 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.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.Dec 2, 2022 · Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. CNC Ported LS1/LS6 243/799 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. Check out Our Other Articles: Everything You Need to Know about LS3 Heads. 823 Heads – Everything You Should Know About. All About 243 ...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...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.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 ...Once you receive the new ported heads, just send us your OEM heads for the core refund. Available options: (Porting Service) GPI - LS1 Cylinder Head Porting Service. $ 1,095.00. (Purchase Outright) GPI - LS1 Cylinder Head Porting Service + OEM LS1 Cylinder Head Set Core. $ 1,795.00. Your selection: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 ...We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers. These heads have been disassembled, inspected, cleaned, 5 angle valve job, and milled slightly to clean up the heads.This head is intended for blocks that feature a minimum cylinder bore diameter of 4.00 inches. The LS3 cylinder head has 260-cc intake runners and 92-cc exhaust ports. In addition, it has a combustion chamber volume of about 68.4 cc. These heads fit any LS engine with cylinder bores of 4.000 inches or larger.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.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. What heads are better 706 or 243? The 243 head has 2.0″ intake valves and 1.55 exh. The 706 uses 1.89 ...GM 243, 799, & 317 LS2/LS6 Options: Performance Rebuild Package Our Performance Rebuild option includes our high end CNC'd valve jobs, precision valve grinding, milling to any chamber volume, cleaning, inspection, and professional assembly. Typical gains are 10-20rwhp. 226cc Full CNC Porting Package The go-to head for 450-500rwhp 5.7/6L's.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.oil catch can, Pacesetters LT Headers,3500 Stall, K&N CA, bmr drag bags. We can port and valvejob your 243's, install the larger 2.02"/1.57" stainless valves, and the PRC .650" lift dual springs all for $1200. That makes them the equivalent of our PRC Stage 2.5 heads, just with your used castings. Additional milling is free of course.Wanting to tax the flow capacity of the cylinder heads, we installed an aggressive hydraulic roller cam from Comp Cams. The LSR cathedral-port profile offers 0.624 lift (with 1.7:1 rocker ratio), 239/247 duration (at 0.050), and a 114-degree lobe-separation angle. The lift was slightly higher with the 1.72 roller rockers run on most of the heads.The LS4 is a 4th gen, 5.3 l aluminum small block engine that was used in GM cars between 2005 and 2009. They had cathedral port cylinder heads and used Active Fuel Management (AFM). The LS4 cylinder heads came with two casting series numbers - 799 and 243. The combustion chamber volume is 65cc.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.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.ForceFed86. 2515 posts · Joined 2012. #4 · Jul 30, 2014. Sure they are. They just flow less. At .050 on the same flow bench a 243 flowed 251/176 VS a 862 at 218/163. One article I read showed a direct head swap with no other changes was worth 24ftlb. The CC in the 862 is 61cc VS the 243's 64cc I believe. So you need to factor that in as well.C5 Tech - Difference between 241, 243 and 853 heads?? - Whats the difference? I have 853's, which heads are good for porting and which flow the best? Thanks. Log In; Register; Forums. ... 853, 862, casting, chamber, combustion, differance, difference, head, heads, ls1, number, ported. Back to Subforum. C5 Tech. View Next Unread '99 Stumbling ...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.Price wise both companies are very close to each other. TEA Stage 2 Heads $1320 w/ 2.04/1.57 valves and dual springs. AI CNC Heads are $1245 w/ new stock valves and dual springs. It seems like the TEA has an obvious advantage in flow with the 2.04 intake valves but AI does not have any options for larger valves on their website.Just picked up a set of 862 5.3l heads for $100 and was wondering how well they will work for me. I have a forged 346 and the pistons have a small dish. I haven't done the math but the CR is around 9.2-9.4:1. I want to bring the CR back up to around 10:1. My plans are to hog the heads out and throw in some big valves and have them milled to get ...7477 posts · Joined 2005. #2 · Jun 22, 2012. A stock pair of 243 heads can gain about 20 hp on a bolt-on LS1. Since you already have a cam, you might see a bit more. If your budget does not allow a full porting job, don't sweat it, just swapping to 243 alone will be a big help.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 .If you are hearing that both 799 and 243 heads are the same, here is where you will spot the main difference. The 799 cylinder heads have a sand casting and finish, which makes them rough. On the other hand, the 243 heads have a metal casting and finish, which makes them smoother than sand casting ones. I didn't notice that myself at first.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 ...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.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 headsThe 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.MLS Head Gasket for Notched 853, 862, 806 LS Heads. Fits 1997-2013 4.8L 5.3L 5.7L LS-Based V8 Engines. These gaskets are specifically designed for the 2001-earlier LS1, 4.8L truck and 5.3L truck heads that have a "notch" in the cylinder head deck, preventing them from sealing with a conventional MLS gasket. Can also be used on the later heads ...C5 Tech - 853 heads vs 241 castings - :sadangel:I have an 04 coupe with stock heads but I just purchased a set of ported and polisshed 853 castings. ... For a n/a car, most start with 243 or 5.3l (862 or 706) heads for the compression benefits. Not many mess with modifying LS1 heads anymore, at least not like they did in years past. Reply Like ...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.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.Feb 23, 2021 · 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?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.The LS engines with 799 heads are 5.3L and 4.8L. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. The smaller combustion chamber with a higher compression ratio offers increased power output. The 799 LS heads boost horsepower up to 25 hp.IMO, a 243 CNC head and LS6 intake (or spend the chese for a FAST 92) will definately make a great street motor. i made peak power at 6000 rpms and shift at 6600 rpms. its a mule and could last forever if i didnt decide to spray it all the time . 1999 Pontiac Trans Am. Save Share.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 ...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.An interesting finding is that in contrast; an LS1 head is 10-30 CFM below an LS6 head through out the range, stock and ported, except in the following instance when coupled with an LS6 manifold: Ported LS1: 166 / 211 / 229 / 244 / 257 / 269 / 277 / 283. + Port matched LS6 Intake Manifold. Note that the ported LS1 head with the LS6 manifold out ...Compression Ratio & Combustion Chamber Size. I'm looking to install a set of 243/799 heads on my 5.3. The stock heads have a combustion chamber volume of 61.15cc, and 243/799 heads have a volume of 64.45cc. My stock compression ratio is 9.5:1. I already know that I need to mill the heads .007" to lose 1cc of volume.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...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 ...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.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.#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.CNC ported GM 243/799 Castings Competition 5 Angle Valve Job 2.0" Intake & 1.55" Exhaust Valves 227cc intake runner, 84cc exhaust 62cc chambers Completely Assembled with our QCS Dual 660 Valve Springs w/ Titanium Retainers Laser Engraved QCS logo Sold in Pairs Lift Intake Flow Exhaust Flow .200" 148The 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 intake and exhaust ports on the 243 heads are larger than those on the 799 heads, which allows for more air and fuel to enter the engine. This can result in higher horsepower and torque output. However, the smaller ports on the 799 heads can provide better velocity and airflow at lower RPMs, which can be beneficial for street-driven vehicles.And yes, non offset rockers from a 317 head will work on the 243 heads. thats pretty impressive, some big numbers hoping ill crack 420whp+ with 364 cubes with 243s I've read so much garbage about the rod bolts i really don't know if i should replace them with arp or leave them in, its a 50/50 discussion on if you're going to have to resize or ...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.But, the combustion chambers are bigger than the 5.3 heads. You need to mill the 243 heads about .020" to keep the compression ratio the same. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow.The 862 head is commonly utilized in high-performance cars, racing, and sports cars. It’s also found in some luxury and sports cars. The 862 is a 12-valve design that utilizes two intake valves per cylinder and one exhaust valve per cylinder. The combustion chamber volume is 84cc for the 862S, 83cc for the 862C, 84cc for the 862F, 82cc for ...The 243/799 heads made more power than the 317's in back to back N/A, and boosted, dyno pulls on the same motor. Sounds to me like you've already convinced yourself the 317 is the better head, so I'm not sure why your on here asking. Besides, from your post, headers are too small, so the head choice may be irrelevant.CHICAGO, IL / ACCESSWIRE / April 17, 2023 / A challenge in analyzing these Global Annual Reports is that there are no standard headings like there... CHICAGO, IL / ACCESSWIRE / Apr...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:May 12, 2013 · 1231 posts · Joined 2007. #1 · May 12, 2013. Have a stock bottom and 5.3. The heads on it right now are 862's. I'm approaching 20psi on the engine. Would it be worth it to switch to some ported and milled .025 317 heads? Running pump gas/c16 mixed. 1980 Chevy luv truck. Stock 6.0.1291 posts · Joined 2007. #12 · Feb 3, 2010 (Edited) i purchased at set of 799 heads last summer for $100.00 bucks ,from another member on this forum. keep us posted when this project is complete. im going the budget daily driver route myself. i will be topping mine of with a fast,and a ported throttle body.The 862 head is commonly utilized in high-performance cars, racing, and sports cars. It’s also found i, The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the mo, The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like, The 2007 year had three 5.3L motors offered. The 2007 Classic (still a NBS) had the 5.3L with either the L59 (, Is 862 Heads Any Good? If you are asking, “Are 862 heads any good?” The 862 heads are pretty good because they can del, Of course, today's 5.3 and 4.8 both have 243 he, Sort by: Add a Comment. J8ke_Stampede. • 1 yr. ago. There's , The LS3 was run with a Holley HP management system and F, Newly reworked 243 heads versus AFR heads. Hi guys, I have, Colleges and new high school graduates have what I think is a strang, 30920 posts · Joined 2007. #6 · Aug 12, 2011 (Edited) They ma, Head circumference is a measurement of a child's head around its large, 7477 posts · Joined 2005. #2 · Jun 22, 2012. A stock p, OEM GM 862 cylinder heads removed remanufactured at 32k • An, The intake and exhaust ports on the 243 heads are larger than those , 715 posts · Joined 2008. #5 · Sep 23, 2012. Holdener did some 5.3 , GM never made an iron LS1. Look at the front of the block a, Ai GM 243 LS2/LS6 Performance Rebuild Cylinder Head Package. Our.