So, casting 862 heads would do favors for your car with a perfect set up. Last Words. In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.With a massive online catalog, you can easily view our inventory of Chevy 350 cylinder heads. The knowledgeable staff at CCH would also be happy to help you choose the cylinder head that is right for your needs. Contact Clearwater Cylinder Head Inc. toll-free at 1-800-572-1963.243's are capable of great hp and tq...485rwhp/431rwtq is pretty good..he's got a cam according to video if im not mistaken... ive seen results of AI's 243 cylinder heads on stock cube/cammed LS2's make close to that...as far as hand porting goes if someone has got tons of experience doing it they ARE able to run with CNC'd heads...all you had was handporting in the old daysIve read and read and read and just cant seem to find what the best head for a lm7 5.3 for the money. Right now i have a set of 706 heads on my 5.3 that came stock on it. Now would it be better just doing a port and polish and ls6 valve springs ? or get a set of 243/799 and milling them down to keep the right compression ratio. I want to learn so tell me the truth !Yes direct swap. Heads alone won't get you to 370+ WHP, you will gain a very decent amount of torque and hp though off full exhaust and heads, I'd say close to 350 to 360whp with a tune and heads/full exhaust bolt-ons etc. A nice mild cam would compliment the use of those heads and could net you near 400whp.Please post more pics of your P&P 243's and average performance gains with DD cam similar to the one mentioned earlier. By the way, the quality of workmanship it first rate. Thank you advance for your consideration. Best Regards, Pedders XA Track 1, Patriot/Zamora's Racing Heads Mission, TX Stage 3 243 Heads, Forged 403 Eagle ESP Stroker, TSP ...Chevy 706 LS Heads are high-performing cylinder heads that offer enormous power at an incredible price. They are the most affordable and most effective remanufactured cylinder heads that can be used for a 4.8L, 5.3L, and even 6.0L LS engine build. Their thin cross-section depicts a high-velocity and smaller-volume runner design with an ...Work on the Nigeria Startup Bill started earlier in 2021 and has involved investors, startups and government representatives. A bill to formalize relations between startups and reg...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 ...6000. HO 6000 engine in a 2003 Cadillac Escalade EXTThe Vortec 6000, or LQ4, is a V8 truck engine. It is a bored version of the Vortec 5300. Displacement is 6.0 L (5967 cc) from 101.6 mm bore and 92 mm stroke. It is an iron/aluminum design and produces 300-325 hp (224-242 kW) and 360-370 ft·lbf (488-502 N·m).Mar 21, 2014 · KCS. 730 posts · Joined 2009. #9 · Mar 22, 2014. The seat insert itself is 2.02", so going bigger than that would be pointless without swapping out the seats. To use a 2.04" valve on a stock seat, you would have to cut the seat small at 2.02" so it is still on the iron seat, which I don't think is any better than just using a 2.02" valve.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.There are many types of flat head screwdrivers. Find out more about flat head screwdrivers from this article. Advertisement The flat head screwdriver is probably one of the most co...Sep 16, 2022 · The General Electric LM2500 engine with its 243 heads is a powerful and reliable marine gas turbine that is widely used in naval and commercial marine applications. With its high power output, efficient design, and robust construction, the LM2500 engine is capable of delivering exceptional performance and reliability in even the harshest marine ...441-A late-model smog head installed on 350-cid engines, the 441 casting has 76cc combustion chambers and 1.94/1.50-inch valves. Although the intake ports are only 155cc's, these heads deliver ...Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5.3/4.8 had the casting notch. The notch disappears sometime in 2001 but nobody is sure. Only way to verify is to physically look for the notch on the gasket surface. If the heads have the notch, you must use the early graphite gaskets.Last updated on 05/06/2024. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. For marketing purposes, it was also known as the Vortec 5300. The engine specs and information listed here is for a stock LC9 engine. Mechanically similar, General Motors’ LS and LS-based …Apart from 823 heads, you can easily come across 821, 799, 243, and 706 cylinder heads. I have tested these to summarize this rundown for you, so check it out! 821 vs 823 Heads. Basically, this couple has the same structure yet different valve and spring technology.Do not do that. 706's have 61.5 cc chambers and 243's have 64.5 cc chambers so you will lose compression unless you mill down the 243's. 799 and 243 heads are generally accepted as 100% identical. The 243 could come on a truck, or a z06 with lightweight valves, which are also longer than all the other standard LS valves.stock 243's are worth about 15 rwhp, with cam and headers maybe 20-25 rwhp at most. i was in the same boat decided to hold the 243's until next yr or longer and send them to cartek for a 2X job and mill then then they will be worth about 40 to 50 rwhp. somebody else on the forum will come along and give you some more advice from experience with stock 243's. good luck btw what cam will you be ...Are 243 heads cathedral Port? Usually, conventional small-block heads did not flow nearly as much air as the best factory cathedral port heads.The 243, 799, and 317 castings of these cathedral port heads could flow up to 250 cfm which was a major improvement over what preceded them. But the LS3 heads took this concept even …05 LS2. I know the cam is .525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? I think you're limited to around .550 with the LS6 springs. A lot of guys go to 918 springs with mild camshafts like the GT2-3. Doing the math on a 1.8 rocker makes it .554 lift.LS1 with 862 heads. I may have found an LS1 shortblock I can drop in my truck but I want to know if I can use the 862 heads from my 4.8 on the LS1. Also, what will the CR be if I use the 862's on the LS1. Thanks in advance. It will bump your CR up a hair, 4.8/5.3 heads and LS1 heads flow the same, the only difference is the combustion chamber.Some of the most sought-after cylinder heads for GM s LS engines are the 243 heads. They're often referred to as LS6 heads, as they were originally used on the 2001 to 2006 LS6 engine. These 243 heads feature a distinctive D-shaped exhaust port coupled with cathedral-shaped intake ports that provide better breathing capabilities and …The 243/799 cylinder heads come with a 2.00" intake valve, 210cc intake runner, a 1.55" exhaust valve, 75cc exhaust runner, and it has a 64.5cc combustion chamber. The 243/799 3cc bigger combustion chamber might not seem like much but let's look at the factory Compression Ratio as seen here. And then compare it with the 243/799 cylinder head ...What did 243 heads come on? 9 Minutes Read . Our team of experienced writers and industry experts are dedicated to providing valuable and informative content to help you make informed decisions about your next car purchase. Stay tuned for exciting content and join the conversation by commenting on our posts.In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2.02/1.6 valves and the 300hp/327s retained the 1.94/1.5 valves (the 250hp base engine got the pyramid heads with 1.72/1.5 valves, no good!). These first "fuelie" heads were 3782461 castings and some 461s got an X added.243 didn't come on 5.3s.look for the casting number on the head.get some 243s for $400 at the ls corvette forums.do a good valve job and install good springs,comp918 etc..if you have the money and know a good head porter ,port the heads.the 243s will add 20 hp .450 rwhp takes great heads and intake,a lot of supporting mods ,and the right cam.it can be done ,whats your budget.2007 head issues #243 vs. #799. I read a thread not long ago on C6 general about a difference in the heads on the born in Oct. 06 C6's that GM used, they used #799 heads as opposed to #243 heads. The person who wrote the thread said his numbers on the dyno where significantly off from other vettes tested. They said there was a difference in the ...I believe that any 5.4L sohc motor has the P.I. heads on them. Flip. 1997 GT, 5-speed, Lazer red with Gray leather. Headswapped and Bullitt intaked 4.6L SOHC (Everything but the bottom end and a power adder), MM Road and Track box (except for Steeda CC plates, no 4 pt lower chassis brace due to long tubes, Cobra STB and Kenny Brown double cross ...For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. ... Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02 ...196 (Nash Design) American Motors' first straight-six engine was the 196 cubic inch (195.6 cu in (3.2 L)) produced from 1952 through 1965, initially as a flathead (L-head) side-valve, and later an overhead valve (OHV) version.. The 196 was originally designed to be an economy engine by Nash Motors, the company that merged with Hudson to form AMC in 1954.Scoring a 4.8 or 5.3 with 243 factory heads tomorrow. It's out of a 2007 Tahoe. I've been told that 4.8s didn't come with 243s only the 5.3s? Can anybody verify? I'm only paying $150 for the whole thing so I'm pretty happy. Also, is there a way without the vehicle vin to identify what it is...13305 posts · Joined 2004. #1 · Feb 26, 2007. I am second guessing myself, need some extra advice. I am about to swap out my stock 241 heads off my LS1 for some Stage 2E ported heads from MTI, casting #853. These heads flow 294.8 @.600 for the intake and 208.4 @.600 for the exhaust. Since this seems like going backwards (from …Oct 12, 2017 · Last updated on 05/06/2024. The 5.7L LS1 is the original Gen. 3 small block engine from General Motors used in cars from 1997-2004. The LS1 engine specs and information here is for the stock 5.7L LS1 engine. Mechanically similar, GM’s LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, …Receive notifications when cylinder heads are in stock and ready to ship. First ... Leave this field empty if you're human: FED LS1/2/6 Cathedral 243 Stage 2 $ 2,784.96. Beautiful set of 243’s are on the shelf and ready to ship. The heads are assembled ... o Valve Guide Clearance – Your FED Heads come with proper guide clearance for ...799 '05-up 4.8L-5.3L truck heads (these are basically 243 heads) See All 19 Photos L92 heads (often referred to as LS3 heads) moved to a rectangular port and are some of the best LS heads ever ...Same heads. 243/799 castings. But the LS6 (Z06) had hollow intake and sodium filled exhaust valves. Believe that is the valve arrangement. Either way, they had lighter valves. I went with a set of 243 heads off an 08' 5.3L truck engine. Sent them to Advanced Induction for their cnc magic. Get the set off the LS2.Auto Parts Blog. 243 heads: 243 heads specs that make it special. By TheAutoly Team. 243 heads. Last updated on September 6th, 2023 at 04:12 am. …243 heads, 05/06 FRC~ Jump to Latest Follow ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums. Appearance/Detailing LS1/LS2 Engine Tech Texas Drivetrain Wheels/Tires. Top Contributors this Month View AllThe good thing about the 416 head is the small chamber for the small bore engines, but don't be fooled, these heads will not make nearly the power a Vortec head will. With the 416 head on a 350, they work well with a 1.94 valve, with the chamber opened to unshroud the valve and a smaller cam in the 220 duration at .050 range.We would like to show you a description here but the site won’t allow us.Nov 12, 2009 · ported 243s, ls2 stock shorty + cam. procharged. 740~whp. That sounds healthy. If I can pull off 700 rwhp like that through my A4 for the time being with 234's or 317's I think I'll be satisfied. SOFAKINGGR8 said: Numbers in sig, recently made over 700whp a few weeks ago, and have been over 600whp since April.NEW GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. $349.99. Generation III V8 cathedral intake port cylinder head. Casting 12564243. For truck, van, SUV and perfomance applications. Used on LS6, L33, L20, LH6, LY5, LMG, LC9,LS4, LH8, LS2, LFA, LZ1 engines. Add to Wishlist. Skip to the end of the images gallery. Skip to the beginning of the images gallery.Compatible Engine Type. Anyone who is considering getting either the 799 or 243-cylinder head needs to know about their engine compatibility to make sure they …I guess I'll start: "243 Heads" come standard on LS6 and LS2 Engines. They are a straight swap onto an LS1 Engine. They will give you more power, because they flow better than the "241 Heads" that are on the LS1 Engine. You can tell if its an "241" or "243" head by the stamping on the top front side of the head. -Nick.Please post more pics of your P&P 243's and average performance gains with DD cam similar to the one mentioned earlier. By the way, the quality of workmanship it first rate. Thank you advance for your consideration. Best Regards, Pedders XA Track 1, Patriot/Zamora's Racing Heads Mission, TX Stage 3 243 Heads, Forged 403 Eagle ESP Stroker, TSP ...But, outside of that I figured that lightly messaging the heads and the addition of an appropriate aftermarket camshaft (about 220/230 duration with .570-.585 lift and a 114 lsa) would put me in the ball park. Now, the owner of the heads I bought said they did not have the sodium filled valves we've come to expect from other 243 heads.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 .Jan 21, 2022 · RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...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. 14' GMC RCSB TVS1900.One of the most powerful figures in the company is leaving amid complaints that she enabled racial discrimination. Karen Parkin, Adidas’s head of human resources and one of its six...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...243 heads are 243 heads (different hardware for different short blocks though, i.e. LS6, LS2). 806, 853 and 241 all share the same ports. They are cast in different manners so the surface finishes are different which may slightly influence turbulence at certain lifts. The 853 and 241 heads have the same chamber size.The 243 LS6 heads have a larger intake port, too. If all the 241/243/799 castings use the same size valves, the extra flow has to come from something different. I believe the 243/799 heads also have a straighter, better flow path than 241s do.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 …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 ...Bumpers said: yea they will bolt right up. 799 is the same as a 243 head that comes on the ls2/ls6 ect.. they will bolt right up and should give you i think around 10.5to1 compression... they are pretty good stock heads. im running a set of 243s milled and p&p on my lq4. you will be just fine just need some tuning wich you will need anyways.Richard is the man with any question you could possible have. If you don't go though a vendor like that, a set of worked 243/799 that have been milled .030 would be great. I would venture to say that WCCH could build you a head that outperforms anything else on the market hands down. AFR isn't bad by any means though. They make a great …Patrik Balent. Updated on January 5, 2023. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. It is …Patrik Balent. Updated on January 5, 2023. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. It is …The two types of heads, 241s and 243s are found in many vehicles. The combustion chambers for each of these types differ slightly: 243 heads have an internal volume of 65cc while 241s have a 67cc size. Due to this difference in size, the compression ratio for 243 heads is higher than that of 241s, meaning that more power can be generated from ...Jul 16, 2007 · Thanks. 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.Welcome to the forum! '70 model #13 heads were the big valve D port head used on the common '70 model YS & XH codes 400 4bbl engines. -YS engines were the base 400 automatic engines in '70 GTO's & '70 Formulas. -XH engines were the base 400 automatic engines in '70 GrandPrixs. -Untouched low mile casting #13 heads will have chambers that cc in ...In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2.02/1.6 valves and the 300hp/327s retained the 1.94/1.5 valves (the 250hp base engine got the pyramid heads with 1.72/1.5 valves, no good!). These first "fuelie" heads were 3782461 castings and some 461s got an X added.What prompts this question is that I was running 10.9x second ET's at the track with 508 rwhp, using stock 243 heads. I then went to a turbo setup, making 639 rwhp @ 8 PSI on 317 heads. I was anticipating some 10.4 second or possibly faster ET's, in good weather, with the additional 130 rwhp. Well before I got a chance to get the car to the ...DualQuadDave Discussion starter. 1019 posts · Joined 2017. #1 · Oct 7, 2018. Hi all, I am looking for info/opinions on doing a big valve 243 head. I have researched and about 2.04 is max size for stock seats. I have a motor that I want to do a 2.08-2.100 valve and shoot for 330-340cfm int flow. Motor is 4.005 bore, .620 int lift.The L76 is a 6.0L, Gen. 4, aluminum small block engine used in both GM cars and trucks from 2007 to 2009. This article is dedicated specifically to the truck and SUV version of the L76 engine. (NOTE: Don't confuse the engine specs here with the L-76 5.4L small block which could be found in the C2 Sting Ray Corvette in 1964.)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 ...Just a rule of thumb, Most your 70's 454's will come with either the 781's or 049's unless it's a early rectangle port motor. Once you get to 1980 you start seeing way more of the 454's with peanut port heads. I won't list actual years, this is just a rule of thumb when I am looking to get a 454 core motor. 1968 Chevelle Sb.They did not receive the more aggressive 204/218-degrees duration at 0.050 with 0.551/0.547 lift cam or the higher flowing 243 heads. Regardless, Dino was one happy camper who couldn't wait to ...The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243's. Valve sizes are identical in both sets of heads. I know that when replacing heads you should have them worked (e.g.- valve job, and such).243 Heads/Cam Dyno. 8642 Views 94 Replies 20 Participants Last post by Perdieu, Jul 5, 2006 Jump to Latest Baaa ...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 ...CBN milled to ensure a super smooth finish. (CBN stands for Cubic Boron Nitride and is best for cast-iron heads). All necessary parts are cleaned and inspected before final assembly to meet AERA specifications. JJ Original Equipment offers buyers a 90-days (Unlimited Miles) warranty for Remanufactured Cylinder Heads beginning on the ship date.Thanks! 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.I've also decided to go with the Flowtech Induction ported 243 heads with stock valves. The cam will customized around those heads and my goals/usage. Won't end up having Ed do the port work till November or December, but can't wait to get the cam and see what he's come up with.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 budget, the 862 cylinder heads might be a good port for you.. With the smallest displacement of all the engines in the The LS4 engine is a Gen. 4, 5.3L, aluminum small 799 Vs 243 Heads: Main Feature Comparison ... The 799 cylinder heads come with a 64 cc combustion chamber, whereas the 243 comes with a 65 cc combustion chamber. ... On the other hand, 799 head did ensure a powerful ride with a maximum of 25 HP. However, it eventually affected the vehicle's fuel efficiency. But I did not have any such problem ... assembling my ls1 with 243 heads. Just Porting is not always a good idea. but having proeprly ported heads to your application is. I took a new set of GM 243 heads to a friend, and we cleaned up or polished the rough edges inside. not really porting to make the runners larger Then he milled the heads down to approx 60.5cc. SW LTs, SW Cat Back, HPE S-Cam, 243 Heads, Patriot ...
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