I'd still hold cam durations under the mid-230s with fairly wide lobe separation if using it, though (such as Comp's 280XFI HR13).For what my 1 cent is worth I think the cam you are looking for is the GM 'Ramjet' p/n 14097395 cam. The Marine swap is discussed in detail on the Pacific Performance Engineering forums. As the late computer also runs the trans, this approach may be preferable to going to a complete aftermarket setup. You can keep the stock computer, reflashing it with available aftermarket software. The throttle body sits in the same place as the stock truck 元1 intake, so most aftermarket superchargers and cold-air intakes bolt on.

The marine port-injection intake manifold accepts the stock Vortec throttle body and smog equipment. In fact, GM installed real port fuel injection on marine versions of the 元1 Vortec engines. The SCPI already uses a high-pressure fuel supply system. One solution is to convert the SCPI system to a true direct multiport fuel-injection (MPFI) system with real port injectors attached to fuel rails. Making 400 hp like we did on the Cheap 350 requires an alternative approach. No matter what you do with either setup, even on a perfect day you're probably only looking at 340 to 350 hp. Still, the kit does seem to solve the driveability problems seen on some SCPI stockers. In fact, GM does not even service the injectors separately. However, these injectors are still not a standard direct-port fuel injector configuration, so they cannot be upgraded with higher-capacity units. The kit moves the injectors out of the original fuel meter, relocating them downstream in place of the troublesome poppet valves.

Also required is a seal kit, upper-to-lower intake (PN 17113206), and a new fuel meter body bracket (PN 93442096). According to Burt Chevrolet, GM finally issued a service MFI (multiport flexible injection) kit (PN 93441235) that includes a new fuel meter body, a regulator, eight drivers, eight Multec-2-style injectors, electrical connectors, and lines to connect the drivers in the fuel meter body to the injectors. Initially, GM recommended an injector-cleaning process, but it was only a temporary fix-eventually the problem would recur. The problem was usually most apparent under cold start-up conditions after sitting overnight. Deposit buildup on the valve's ball and seat would cause the valve to stick open or closed, resulting in a misfueled cylinder and consequent misfire. The original SCPI poppet valves proved problematic.

Roller cam for tbi 350