Inliners International Forums General Discussion Blown and Injected On a budget, Turbo or EFI first for stock GM 250?

I would get a bolt on EFI kit that have the injectors above the throttle blades, an overdrive transmission and steep rear gears, like 3.73-4.56.

My recommendation would be the MSD Atomic Throttle body ($999) with the transmission controller ($625.99). Then get a 4L60e with torque converter from a 6-cylinder vehichle (like an Astro Van), which should be about as cheap as a 4L60e gets. You won't make enough power, pre-turboing, to need anything more than a stock build. Then with some high-3 to mid-4 rear gears it's going to be a riot streetlight to streetlight and with the overdrive purr along at 75mph in the 2500-3000rpm range depending on gears and tire size.

If that isn't enough fun, the Atomic supports up to 14psi of boost, at which point you may need to upgrade a few parts in the transmisson or maybe get away with some firmer shifting in the programming.

If you re-consider the 4.2, a pair of Microsquirts ($300 each, plus $100 in wiring) will run it and the transmission.