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 ...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.It is way too small for an LQ4 IMO. I would do a set of ported 243 heads from either AI, TEA or TSP in that order. For a cam I would look at something like the TSP TQv2 or MS3. My cousin had an LQ4 with patriot ported 243 heads and an MS3 and it drove great behind a T56 with stock 3.42 gears.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).There are significant differences between the LS1 and LS2 cylinder heads. The main function of cylinder heads is to control the inflow and outflow of air in the engine. One key difference is that LS2 cylinder heads allow more airflow as compared to LS1 heads. Further, the combustion chamber of LS1 has a volume of 67cc, which is larger …Well, I switched from the 223 to the 243. Two reasons: first, the shafts in my 223s were not the correct shafts ( too light 105g); and, second, the gapping on the the 223 made no sense with 5* difference on the scoring clubs (8 thru GW). Findings after 4 rounds. The spec for the shafts is .25 inches longer. The head is definitely smaller.For the price you pay for us to port 241s they will flow the same numbers as a stock 243 head." ... but I just noticed that Ai's 706/862 5.3 heads flow tremendously especially on the exhaust CFM (269CFM at .600). I just don't know how I could really benefit more from such a high exhaust CFM vs. having a higher intake CFM on TSP's 2.5 LS6 ...However, the main distinguishing feature of the 862 cylinder head design is its unique ability to dramatically enhance air compression delivered following porting. While some may argue that the 243 heads are better, 862 heads deliver improved airflow, quality, performance, and power. Moreover, 862-cylinder heads are compatible with many cars.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 ...Curious on what factory head would be better on my 2002 4.8. Factory has the 862 heads. I’ve been offered a 5.3 block with 243 heads on it for $300. Would the stock 243 heads work better on it than the 862 heads? Obviously they need to go to the machine shop to be looked over but without any alterations to the stock form, which is the better ...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.looking at ported heads. vs new heads and flow numbers. TEA has some great flow numbers on 243 heads and i have a set headed that way, but, looking thru builds online vs bbc builds, thinking about 310 cfm at .600 lift numbers in an ls, dont see many builds that make 2 hp per cfm, wondering were the limitiing factor is, intake manifolds ...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...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 ...Get the best deals for ls 243 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. Shop by category ... 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 ...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 …Showing the progress Porting the 862’s for my Turbo 4.8 project. Yes it’s a slow process and I limit how much I can do each day.I’m in the dirtiest portion ...Aug 1, 2023 · The 862 Cylinder Heads. Features and Specifications. In contrast to the 243 heads, the 862 cylinder heads are typically made of cast iron, which makes them heavier but also more durable. They have smaller ports compared to the 243 heads, which can limit airflow to some extent.Apr 2, 2020 · 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 ...Over the weekend, robbers broke into the crypt of a Dublin church and stole the head of an 800-year-old mummy called “The Crusader.” Grave robbing might sound like a crime from a b...My car is an ls2 of course, but with stock injectors, fuel pump, and stock catback exhaust, and with stage 2 ported intake, tb,hpe 243 heads, megadeath cam, and slp underdrive pulley with lpe cai did 450 rwhp. The injectors were at 124 percent duty cycle, and we were losing fuel pressure above 6300 rpm.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.The 799 and 862 heads have their own pros and cons. While the 799 heads offer better flow and performance, the 862 heads offer better combustion chamber design and improved efficiency. Ultimately, the choice depends on the specific needs and goals of the engine. Pros of Using 862 Heads. Cons of Using 862 Heads.BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. 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. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It ...Dec 24, 2017 · 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 ...In contrast to the 243 heads, the 862 cylinder heads are typically made of cast iron, which makes them heavier but also more durable. They have smaller ports compared to the 243 heads, which can limit airflow to some extent.The 5.3 heads will have a casting number of 862 or 706. The 5.7 heads can have 806 (97-98 perimeter bolt), 241 or 853 (99-up LS1 heads), and 243 (LS6/LS2 heads). The factory chamber on a 5.3 head is approx. 61cc. Some guys will use 5.3 heads to up their compression. The heads flow like a LS1, but have the smaller chamber.See All 18 Photos. After installation of the TrackMax cam, the power output of the 6.0L LY6 jumped from 443 hp and 467 lb-ft of torque to 514 hp at 5,900 rpm and 493 lb-ft of torque at 4,600 rpm ...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.According to the trusty flow bench, the chamber work did indeed improve the flow rate of our 706 heads, with the largest gains coming at 0.200 lift for the intake and 0.400 lift for the exhaust ...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.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.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.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...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.It happens to even the best DIYer: the simple process of removing a screw becomes a struggle when the screw refuses to budge and the head of the screw becomes stripped. But not all...There is a very minor gain in compression with the L92's, but a big gain in airflow. The LS6 heads flow the same as the heads already on the LQ9, but offer a .9 or so gain in compression. The L92's will make more hp by far, but with more cost. The LS6 heads will make more torque and are a direct bolt on. It's all in what you want to spend.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.It's about 0.11" smaller than the stock at 2". Exhaust would remain the same at 1.55" The 317 flows quite well stock and can pick up about 70cfm intake/40cfm exhaust with mild work on stock valves from what I've seen. Looking at a high velocity, high torque head on the cheap maybe. If it requires new valve seats I don't think it'd be worth ...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 .Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J...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.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 ...Compression Ratio Calculator - Wallace Racing. 3.622" x 4.00" / 6.098 rod length / 9.240 deck ht. / 0.008" out the hole / 0.052 gasket / -6.7 cc dish / 4.000" head gasket bore / and either 71.06cc for 317 or 64.45cc for 243's. Note if you do run 243's on the LQ4, the piston raised ring around the dish has been known to interfere with the ...Although the SPM approach is more reliable, porting 862 heads eliminates their distinction. However, porting is expensive; therefore, casting 706 heads in stock form is the best option. 706 Heads vs 317 Heads. Due to their better ports, 317 heads are frequently preferred over 243 and 799 heads, two more expensive modelsI 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.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.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 ...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!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.I’ve been offered a 5.3 block with 243 heads on it for $300. Would the stock 243 heads work better on it than the 862 heads? Obviously they need to go to the …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 ...232cc 243's vs 260cc 821/823's. Jump to Latest Follow ... I think the V3 is designed more for the 243 heads. If you are going 821/823 heads I would ask PCM which cam they recommend for that. 08 BLACK 2WD 3SS - Got a whine under the hood and sounds like its got a miss also..Feb 13, 2020 · 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 ...The reason is simple: The more you squeeze the air and fuel mixture in the combustion chamber, the more power you can create. In theory, forcing air and fuel in as small a combustion chamber as possible (measured in volume) will yield maximum engine compression and horsepower. There are a number of ways to accomplish the task.I flow a stock 706, 862, and 317 LS Head and share the numbers.Jul 31, 2020 · 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 directly.Dec 24, 2017 · 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 ...Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J...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.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)Re: LS 862 head porting. by mag2555 » Thu Jun 02, 2016 11:20 am. Take the wing out of the intake bowl and be dam sure to leave a Venturi in the Exh valve bowl below the seat cuts and if headers will be run be sure to leave the Exh port exit at the flange smaller then the inlet of the header tube , very much so on the floor, in fact do not ...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.ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ...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.Suicidal Racing. 862 are for my ls1 an will make it around 11.9-1 compression and my lq9/ls3 combo will be around 13.5-1..the extra compression going from 10.2-1 on my ls1 to the 11.9-1 should be worth 30hp,the motor has a big cam (243/251 with 23 degrees of overlap) so it really needs the extra compression.BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. 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. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It ...Richard Holdener. 293K subscribers. 2.7K. 174K views 4 years ago WESTECH PERFORMANCE GROUP. ...more. 706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four...The 799 and 862 heads have their own pros and cons. While the 799 heads offer better flow and performance, the 862 heads offer better combustion chamber design and improved efficiency. Ultimately, the choice depends on the specific needs and goals of the engine. Pros of Using 862 Heads. Cons of Using 862 Heads.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 ...You don't need it at 500hp. A 1-7/8" tube typically runs out of room at around 1khp. Your fine. As mentioned, the gains seen from porting won't be huge. The reason is everything is already working pretty darn good as is. It would take a few more radical steps to move north on power.Bandaging that gnarly cut before you head to the emergency room? Snap a pic first. We’ve advised you before to take photos of your children before a big outing, screenshot your boa...Sep 24, 2015 · 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.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.Stock heads with Brian Tooley top end kit installed by PCMOFNC. 2008 Heads had 60k at install and 64k when removed for my LSX head swap this year. Perfectly fine. I can give you my personal info and you can verify with Kelly. 450 OBO plus shipping and PayPal fees. Sent from my SM-G935T using Tapatalk.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 ...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.IMHO. The compression rise isn't worth the trouble and cost of changing heads. With smaller valves it's a step backwards. I would do cam and exhaust work with your exsisting heads. Plus the usual tuning of injectors,computer etc.. My V-Max 6.0 pings on less than 92 octane. The compression is worth everthing.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.Do you know what a Phillips head screwdriver looks like? Find out what a Phillips head screwdriver looks like in this article from HowStuffWorks. Advertisement The Phillips head sc...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.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 .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.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.CorvetteForum - Chevrolet Corvette Forum Discussion. C5 Corvettes, 1997 - 2004. C5 Tech. 243 heads. C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace.See All 18 Photos. After installation of the TrackMax cam, the power output of the 6.0L LY6 jumped from 443 hp and 467 lb-ft of torque to 514 hp at 5,900 rpm and 493 lb-ft of torque at 4,600 rpm ...243/799 have slightly small combustion chambers than 241. 64cc vs 66cc iirc. 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.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 VerdictFor the price you pay for us to port 241s they will flow the same numbers as a stock 243 head." ... but I just noticed that Ai's 706/862 5.3 heads flow tremendously especially on the exhaust CFM (269CFM at .600). I just don't know how I could really benefit more from such a high exhaust CFM vs. having a higher intake CFM on TSP's 2.5 LS6 ...The LS3 head at 265 cc of volume compared to 214. cc for the 243, has much less air velocity at low lifts and low rpms. Now. GM also put the LS3 heads on an engine with 30 more cubic inches; but with an intake runner volume equal to the old big block oval ports, they really seem to shine on 427 cid and larger engines.Damage Inc. 1174 posts · Joined 2007. #5 · Jan 30, 2009. The 317's are basically the same head as the 243's with a much larger chamber. I wouldn't doit. By the time he mills enough off to get your CR back they may be abit thin on the suface. I'd find some 243's and get them worked. They are easy to find these days.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 ...The cheapest way is to have your 243 heads ported, probably less than $1000 without labor and tuning. Patriot heads are about $1300+/-. Most other aftermarket heads will be over $2000 for the heads alone. You can get a whole L92/L76 swap kit for about $2100. To get a Ls2/Ls6 head to flow what a L92/Ls3 head flows will take a lot of work, and .... For cam choices, we went right to the Comp Cams catalog and selecteThe LC9 came in GM trucks and SUVs in 2007-‘11 and made 315 h Re: LS 862 head porting. by mag2555 » Thu Jun 02, 2016 11:20 am. Take the wing out of the intake bowl and be dam sure to leave a Venturi in the Exh valve bowl below the seat cuts and if headers will be run be sure to leave the Exh port exit at the flange smaller then the inlet of the header tube , very much so on the floor, in fact do not ...Talkee lists some free party-line phone numbers are 712-432-7463, 218-862-3788 and 218-862-3784. Numbers for specific groups such as Afro, Anglo, Asian or gay groups are found on t... The 799 and 862 heads have their own pros and cons. While the Do you know what a Phillips head screwdriver looks like? Find out what a Phillips head screwdriver looks like in this article from HowStuffWorks. Advertisement The Phillips head sc...I flow a stock 706, 862, and 317 LS Head and share the numbers. The difference from one 243 head to another is the guy doing the port ...
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