The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. I forgot to add I will not be using boost and what would be the best fuel rails and injectors? I got the diameter but Im needing the length. If youre looking for the last bit of power, the long runner FAST LSXR-T is recommended and accommodates larger102mm throttle bodies. With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. The 241 heads performed slightly better than the 317s, and the 799s were better still. 799 heads came on trucks manufactured around 2005 and above, as well as newer models of 5.3 and 4.8-liter trucks, come with 799 heads. Putting a truck cam in puts you in the zone by itself. Single turbo systems using. [Editors Note:This L33 engine upgrade guide is part of a series ofLS engine upgrade guidesassembled by a team of LS experts at Summit Racing that we are sharing at OnAllCylinders. 9 Minutes Read / Its a fairly straight forward swap and Summit has the cam swap kits that include the gaskets, LS2 timing chain, and damper bolt. 2007 5.3 with 862 heads? - ls1truck.com The 243/799 heads came on the 5.3 "L33 HO" motor in 05. Additionally, this cylinder head boasts a chamber diameter of 3.876 inches, providing plenty of space for combustion and can help increase combustion efficiency when paired with other correctly sized components in your engine setups, such as pistons and rings. CHP. The main difference between the two is from which mold casting the two cylinder heads originally came. Usually found in GM trucks, the LS engines with 799 heads come in two sizes: 5.3L and 4.8L. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. The cylinder heads are designed to offer increased horsepower due to the increased compression which results from the smaller combustion chamber. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. Required fields are marked *. Not air raid intake runners. The 799 LS heads have a D-shaped port. LS engine spec guides and LS-relatedinformationhere. Usually about 7.425, but we recommend the use of a length checker before ordering just in case. They come with all new stainless steel swirl polished 2.00 and 1.57 valves, new springs for up to .650 lift, new retainers, spring seats, and valve seals. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. With the porting process completed, flow numbers have been measured as high as 373 cfm at .Oct 3, 2019 This impressive number is achieved with careful machining of the intake ports and exhaust ports which improves air velocity through both systems. This offers drivers an extra boost of performance without having to make any major modifications or upgrades to the engine itself, meaning you can experience improved acceleration and better fuel economy right away! 4X4 . REMEMBER--just because the heads say '243' doesn't mean it has the lighter weight valves and upgraded valvetrain like the 243 heads that were on the Z06 Corvette. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points.