Upgrades for 402 LS

[WS6]

If your current FAST 90 isn't ported, get that done. I missed that and thought you had the LS2 intake on the engine. The differences between your engine and the vengeance 402 aren't worth the efforts. They got nice peak numbers out of the car but the torque isn't much broader than your curve. It's moved up in the RPM band a tad but holds on longer. Better intake will be the cheapest way to extend your torque band into the upper RPMs which is the biggest advantage that engine has over your current setup.