The LS dirt track engines are finally gaining momentum in the dirt world and racers are getting to experience first-hand what we have been talking about since 2011; the power, flatter torque curves, half the cost (in most cases) and lighter all aluminum builds. There are so many bonuses to this engine platform.
What would you expect to pay for a 15° aluminum head with light weight 8mm valve stems (for a more stable valve train)? What about an aluminum head a with a 2.160 intake valve that will flow in the 350 cfm range with moderate porting? Or a shaft rocker system? Well, these are all factory pieces with the LS engine and, with minor upgrades, will make a lot of reliable power.
The LS cam core was increased from the traditional 1.868” to 2.165. This makes for a much stronger cam when running high pressure springs. It also allows the cam companies to get more aggressive on the cores. With its higher location in the block, a 4” stroke is easily achieved with the stock cam core. In fact, in an LS3 block a 4.125 stroke can be used (although we do not recommend this much stroke in our race engines). The bigger core allows more stable valve action and valve timing from cylinder to cylinder than the small base circle cams used in a traditional small block application with stoker cranks.Details