862 vs 243 heads. #1 · Dec 3, 2013. i want to know if I would pick ...

The 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless.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 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless.The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft …The Enforcer heads have a 210cc intake port volume along with an 82cc exhaust port volume. The heads use a standard LS 15-degree valve angle with a 1.500-inch outside diameter valve spring pocket. The combustion chamber measures 64cc's in size and the heads need an engine with a minimum 3.900-inch bore diameter. Why AFR Introduced The Enforcer.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. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.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 NumbersThe final test was the 246 cam, with .624 lift, a 246/254 degree duration and 114 degree LSA, but with less-than-stellar results. The peak horsepower numbers remained at 626 hp, but peak torque dropped to 575 lb.-ft. In fact, torque production dropped through the entire rev range! Sometimes, even on a stroker, bigger is not always better!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.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.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.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.Tested on a different application, the results would certainly be different. On many of the heads, the results varied by only a couple of horsepower. In the grand scheme, that's insignificant....A good shower doesn’t just get you clean; it also relaxes and refreshes the body and spirit. If your shower isn’t blissing you out, perhaps it’s time to upgrade to a shiny new show...My 2007 came with 243 heads stock. the 862's are off the early 4.8-5.3 motors after about 99 I believe. I also believe texas speed used to have the 2.05 valve opton on those heads at one time. I run 2.04 valves on mine. 12-30-2010, 08:54 AM #7.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.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...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..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.Description. LS1 LS2 CATHEDRAL PORT - 243 CYLINDER HEADS. Sold as a Pair - Bare. Machined - ready for assembly. Suit the 5.7ltr and 6.0ltr. These Cylinder heads are a High-Performance replacement to the GM 243 heads. All factory mounting points with the Performance of the 243 port and chamber. You can use your existing valves & springs.Location. Nebraska. Feb 15, 2009. #6. I have a 6-284 and my idiot ex-hired man had a 243 AI and they both shoot well. My 6-284 is on the edge with high BC bullets and is very picky. I have suspected that that the 6-284 would be better suited to lighter bullets with a slow twist.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 depth of the Columbia River ranges from 20 feet to 170 feet at various points along its route, and its total length is 1,243 miles. Locks, dams and reservoirs built on the Colu...Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Than...Regarding finish, many reviews say 799s deliver a smoother one than its rival when pitching them against each other. 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.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.Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 706/862 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.Office. Aug 3, 2019. #13. There's the #315 head for 64 and 65. There is also a # 080 head for those years. In 66 there was a #178 (early) #234 (late) and also the late #920 head which was used late in 66 and into 67. In 68 when 273's went open chamber and hydraulic cam, they shared the #675 head with the new LA 318.Intake and Exhaust Ports. 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 ...Running just 7 psi, the turbo system improved the power output by 243 hp. But the real question is, would the 706 heads still make more power under boost? After …243/799 heads are identical, except 243 heads from a 02-04 C5Z Vette with the LS6 Engine. Those 243 heads used Hollow Stem and Sodium Filled Intake/Exhaust Valves, which are much lighter. The 243 heads off of a LS6 Engine in the CTS-V uses standard valves. Like mentioned tho, 243 heads have a smoother finish, while 799 heads are a bit rougher.Swapping in 243 heads will increase flow a little, but unless you mill them first, you'll lose compression. If anything, you want to raise compression. For just a basic bolt-on 5.3, the 862 heads will do a decent job. ... The 706 and 862 castings aren't different, much like the 799 and 243 castings are identical. If you have 862s, I would ...806 is the casting # of the heads . Its on the front corner . 806 is the worse flowing LS1 head and has perimeter valve cover bolts .They came stock on the 98-99 F bodys . 241's are a little better . I believe they came on 00-02 . 243's are the best of the 3 . 243's in stock , untouched form will add @ 20-25 RWHP over 806's and 241's.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...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.May want to read through here on the OEM head, just for some reference on the 243 vs. 317 heads on any short block larger than 6.0 especially if you plan to go the boasted route. Personally I would think the smaller chamber 243 head may not be the best bet if you plan a lot (say over 5-6 PSI) of boost pressure.Office. Aug 3, 2019. #13. There's the #315 head for 64 and 65. There is also a # 080 head for those years. In 66 there was a #178 (early) #234 (late) and also the late #920 head which was used late in 66 and into 67. In 68 when 273's went open chamber and hydraulic cam, they shared the #675 head with the new LA 318.823 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 ...Aug 7, 2023 · For the 862 heads, the intake valve size is 1.89 inches and the exhaust valve measures 1.55 inches. The 706 heads, however, feature an intake valve size of 2.00 inches and an exhaust valve size of 1.55 inches. In terms of port volumes, the 706 heads have larger intake ports.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 …40 posts · Joined 2018. #46 · Jan 20, 2020. Your 6.0 block is a 4.00 inch bore, you have to run a LS3 type head 5.3 and 4.8 have smaller bores. There are tons of heads out there yours probably came with the 799 castings like my 6.0 did.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 + $150.00.431 posts · Joined 2019. #9 · Jan 5, 2021. 706 heads out perform all others on a 4.8. Throughout the entire normal rpm range. It's not all just about flow. Those larger flow numbers from other heads are misleading. Yes they flow more than 706 however, only beyond 6000rpm. 706 heads are the best for the 4.8.The 241 castings feature 205cc intake ports, 70cc exhaust ports, and a 2.0/1.55 valve combination. The hot factory heads would be the LS6 (243 castings), but even the stock LS1 heads can be made ...When I first started playing with engines (don't go there, I'm old), and the heads had worn valve guides, it was common practice to either: a)Get them knurled. or. b)Get the stock guides replaced with bronze guides. Bronze guides were considered "THEE best", aka "the shit". Now I'm reading "If you have bronze valve guides you NEED roller …WNY. Dec 23, 2016. #2. I'm no expert on this but, 07 on 5.3's had the 243 heads and from what I read they are the most desirable.The 243 and 799 heads are pretty much the same, dismantlers claim that they often find one of each on the same factory truck engine. You might want to do some research into the 243.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!After spending a very long time googling this, I've seen answers anywhere from 10.1:1 CR to 10.9:1 CR as it seems like people are calling lq9s (half a point high CR factory) lq4s and adding to the confusion. The engine is a 2005 lq4 6.0 with 317 (71 or 72 cc stock) heads and rated at a 9.4:1 CR. The 243/799 heads are 64 or 65 cc.Jun 22, 2021 · Working with the intake and camshaft, the cylinder heads are part of the trio of performance components that dictate the power output of the engine. In the case of the LS3 and (especially) LS7, the factory heads offer exceptional air­flow. Unlike cathedral-port heads (706, 317, 243, etc.), it is difficult to improve upon the power […]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.Sep 1, 2017 · Remember, not all 243 heads are LS6 heads, but all LS6 heads are 243 castings. True LS6 heads will have the stainless steel hollow-stem valves. ... 706/852/862 '99-up 4.8L-5.3L truck heads - 61 ...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.5.3 chevy LS heads 862 to 241 Casting. I recently completed my 5.3 swap in my 90 wrangler, long story short I have a bad valve on cyl #8 low compression. So I was intent on having them rebuilt and called my machine shop, machine shop says he has a set rebuilt someone left and never came back to get, for the same price as having mine rebuilt. So ...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 ...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)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, …PN: TEA-OEMLS2ST2-CUSTOM. GM Factory LS-2/LS-6 Stage 2 PortingOur most powerful CNC ported factory casting for the LS-1 Engines, the Stage 2. Designed using the same 2.04 and 1.57 valves and valve job technology developed and used in the TrickFlow 215cc head this head has awesome mid-lift airflow. It performs on par with most aftermarket heads.Sort by: Add a Comment. J8ke_Stampede. • 1 yr. ago. There's no debate, it's been proven the 862/706 heads will make more power than the 317's. 317's and 241's are the worst factor LS heads. It's also not only because the chamber size and compression ratio either. 862/706 heads have higher velocity and better coefficient of discharge. 8.Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...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...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 ...Locate 862 Heads on sale below with the biggest option of 862 Heads anywhere online. Automobile Parts and Service Toggle navigation Community Chevy Automotive Sales Inc ... Gm Ls 706 806 862 241 799 862 243 Cylinder Head Rebuild Service 3 Buisness Day $459.99 View Item Details Chevrolet Gmc 5.3 Ls Gen Iii V8 Ohv Cylinder Head 862 2 ...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.The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. ... There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM …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 ...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.Dec 16, 2010 · 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.Here’s a quick data sheet on the specs of 799 heads. Due to the similarity, 243 heads should follow the same characteristics in normal situations: Combustion chamber volume: 64.45cc. Intake port volume: 210cc (sometimes seen as 209cc too) Exhaust port volume: 75cc. Intake valve diameter: 2.00 inches.2004 #243 GTO heads vs 2002-2004 #234 LS6 Corvette heads. New guy here, but I've been driving GTOs since I bought my first, a 1970 400 w/THM, back in high school in 1975. I presently own a 2001 Corvette with an all stock LS1 and I've been wanting to bump up the horsepower from 350 to 420-450 (more would not disappoint me).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.Page LS1GTO Forums, HIGH PERFORMANCE Best LS2 243 Cylinder Heads upgrade, DRP GM LS1 LS2 Cathedral Port 243 Heads are a high quality product for a best These 243. Home; Home › ls1 with 243 heads and cam hp › ... Build 862 Vs 317 Heads (compression)?? LS1TECH Camaro And, 43% OFF.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.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.Here's what you need to know if you want to hike Diamond Head on Oahu in the Hawaiian Islands. Update: Some offers mentioned below are no longer available. View the current offers ...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 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.MS4 Cam w/ 243 heads on an LS1. I just recently put together a stock LS1 short block with new bearings, rings, honed cylinders, etc. I put a set of stock 243's on it with all comp trunions, comp springs, and pushrods. I also put an MS4 cam from texas speed in it, .649/.600 239/242 111.5 LSA 110 ICL are the specs.BEFORE Engine - 02 LS1, Stock Bottom End Heads - Stock Flowing 243's Cam - A.I. 230/238 .600/.601 113LSA Intake - LS6 w/42lb Green Tops Hedaers - ShortiesFeatures. Made of Aluminum, 862 heads are lightweight and they dissipate heat more efficiently. They provide better fuel economy and are often used in high …I am beginning to find and spec all the parts I need to start the 6.0L LS swap for my 2002 Silverado. A significant key to the success of this build is the c.... Although the SPM approach is more reliable, portSwapping in 243 heads will increase flow a lit The 862 heads from the 5.3 aren't gonna be the best thing for the LS2, but they will work. I would spend the few extra dollars to find some 243s at least. Reply With Quote. ... 799/243 heads on a LS2/LQ9 put you at 10.9:1 compression. No where near pump gas limits. Don't waste your time with those junky 5.3 heads on the bigger bore motor.For the sake of mass production, the production Gen III V-8 cylinder heads were designed to fit the smallest-bore Gen III V-8 engines--the 4.8L and 5.3L, 3.780-inch-diameter cylinder bore SUV and ... The 4.8L engine is also known as the Vortec 4800. The The Enforcer heads have a 210cc intake port volume along with an 82cc exhaust port volume. The heads use a standard LS 15-degree valve angle with a 1.500-inch outside diameter valve spring pocket. The combustion chamber measures 64cc's in size and the heads need an engine with a minimum 3.900-inch bore diameter. Why AFR Introduced The Enforcer.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. Are you looking for a rental property near you? Finding the right plac...