CAMSHAFTS: COMP CAMS BUMPSTICKS

摘要

Unless the motor has already been pulled out of the car, swapping out cams on a late-model is never fun. Nonetheless, when the motor in question is an LS3 or L99, that hard work will definitely be worth the effort. These sweet mills come equipped with GM's rectangle-port L92 cylinder heads, which flow a stunning 320 cfm from the factory. If you prescribe to the 2hp-per-cfm school of thought as a means of gauging power potential based on cylinder head airflow, it's quite obvious that the stock 6.2L camshaft doesn't come close to taking full advantage of the L92 casting. In fact, the 376ci LS3 uses the same camshaft as in the 346ci '01LS6, albeit with a smidgen more intake lift. Since the factory cam was originally designed for an engine that's 30ci smaller and heads that flow 60 fewer cfm, it's not surprising that the LS3's torque curve plummets rapidly after 4,700 rpm.