This new engine featured head castings that were basically a reduced-size version of the LS7, which had been fitted on an Australian Escalade model back in 2007. According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads. is the best place to get them. The larger chambers make the 317s popular for boosted applications, but know you are starting with a significant deficit by replacing the 706 heads with the 317s. We recommend a dedicated truck cam. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. And for $90 why not. Trans computers were external early on and switched internal later. Would I need to change push rods and pistons or lifters? Want to dress engine up. It is the Lt model and the 8th character of the VIN is 7. Come join the discussion about Silverados, Sierras, and other full size trucks . These cylinder heads feature a rectangular port design, which is also found on 6.0L truck engines and the Pontiac G8 6.0L engine. This is revealed in the 799 head specs outlined above. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. Aki Ito. To put it simply, Chevrolet Performance's LSX 454 crate engine is a powerhouse. The exhaust port features a D-port shape that reduces back pressure while still providing plenty of exhaust flow for increased horsepower and torque output. It was actually the 8th digit of the vehicle identification number. Valve Size: Intake - 1.89, Exhaust - 1.55, Port Volume: Intake - 197 cc, Exhaust - 69 cc, Chamber Diameter (distance across): 3.756, Valve Size: Intake - 2.00, Exhaust - 1.55, Port Volume: Intake - 199 cc, Exhaust - 71 cc, Chamber Diameter (distance across): 3.821, Port Volume: Intake - 212 cc, Exhaust - 76 cc, Chamber Diameter (distance across): 3.923, Port Volume: Intake - 209 cc, Exhaust - 74 cc, Chamber Diameter (distance across): 3.876. The exhaust valve should ideally be 85 percent of the size of the intake valve. The 6.2 liter, 376 cubic inch engine churned out an impressive 638 horsepower, making it an ideal choice for those who demanded serious power and performance under the hood. This was coupled with a 3.876-inch chamber diameter. If you plan on running a power adder or have a long list of upgrades planned, its recommended that you take your truck to a chassis dyno tuner who can give you a custom tune. It connects the intake manifold with the cylinder heads. have a cathedral-shaped intake port. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. There is a .550 lift version of the SUM-8712 coming soon called the SUM-8719. These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide. What you need is a cam that delivers a gut-punch right when the converter hits. Furthermore, aside from the LQ9 which is simply a copycat version of the original LS6 design, these are considered some of best performing OEM cathedral ports ever produced by General Motors. Ultimate LS Cathedral Port Cylinder Heads Guide - LS Engine DIY Im building for factory reliability but adding a little boost for some extra power. CNC Ported 862 LS Heads- The Ultimate New Gen Cylinder Heads The CNC Ported 862 LS Heads are the most demanding cylinder heads in the modern era. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. So I guess its LC9 5.3 . This was an aluminum blocked engine that had the 243/799 heads but didn't have AFM/DOD or VVT. The intake port forms the final part of the air induction system in an engine. The flat-top L33 pistons added some much needed compression. Any other suggestions or maybe even a specific direction to go would be helpful thank you. Yes I have seen L33s with a 799 on one side and a ls6s 243 casting on the other from the factory. 799 heads (65cc chamber and 210cc intake runner) are pretty much 241 LS6 heads worked over for truck. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. If you are changing the pistons, look for the Gen IV heads to get the airflow and the compression bump at the same time. The LQ4 also featured an upgraded valve train, camshafts and larger injectors which allowed for increased power output when combined with aftermarket parts such as cold air intake systems or exhaust upgrades. [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. Should Copper Spray Be Used on a Head Gasket? Truck engine bays make fitting turbos easy. Apr 26, 2023, 2:58 AM PDT. They can handle about 750+ hp and 7,000 rpm in boosted applications (at least for a while). if u wanting to save money i know u can upgrade the stock rocker fulcrums sum sells a kit.otherwise i would just contact a rep from sum to help you find the best part for you.
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