summit racing ls3 hyroolic cam cnc ported cylinder heads

Some manufacturers offer Phaser Limiters and specially ground cams to ensure safe operation. However, when used with a bigger cam, VVT can crash the valves. When tuned correctly, it increases power over the entire rpm range. The L99 was equipped with Variable Valve Timing (VVT). Piston-to-valve clearance is very tight with cams over 230° duration 0.050 in. In addition to valve springs and rockers, the cam needs to match the compression, torque converter, rear-end gears, etc. It reduces hot spots in cylinder #7 that cause the piston rings to butt and crack the piston. Some also go from a 15 degree to a 13.5 degree valve angle for even more power.Ī 4-Corner Steam Kit is another smart upgrade. A wide range of runner and chamber volumes are available. The heads flow better and have thicker decks to maintain head gasket seal. There are many Aftermarket Heads available. to increase compression and better airflow. It is also common to CNC port and/or mill them up to 0.030 in. The lighter hollow stem valves used in the LS3 can be installed in L99 heads to increase the rpm range. The L99 and LS3 heads have rectangle intake ports. The chart below lists standard specs compared to common performance Rotating Assemblies. When you upgrade, a crankshaft with a longer stroke costs about the same and increases displacement. Upgrading to a Forged Crankshaft early in your build will save you the headache later. If you're getting forged pistons, upgrade to Forged Connecting Rods at the same time.Įven though it's cast, the crankshaft can handle about 900 hp. This prevents the piston from rocking at BDC and scraping up the skirts. When stroking, choose a piston with minimal skirt taper. A set of Forged Pistons should be high on your priority list. They will crack in high horsepower engines. The stock pistons are a known weak point. However, you will want to upgrade to Head Studs and Main Studs if you plan on using boost or nitrous.

The block can handle 850 to 1000 horsepower.

When bored and stroked, displacement can be as high as 427 c.i.d. However, we recommended leaving them as thick as possible when running boost. On a stock engine, the following upgrades can improve performance and fuel economy:īelow are more upgrades that will improve the performance of the LS3 and L99 engines. 4, 6.2L, aluminum engines are light and durable, with many options for increasing power.

Summit racing ls3 hyroolic cam cnc ported cylinder heads