Chevy Engine Upgrades
If carb guys can stroke their 350s out to a 383ci big-block killer then so can you. The Jan. 2000 issue of Hot Rod featured a ’91 350 bored 0.030 over that used a 33/4-inch stroke crank to give them a TBI 383. The long-block was built up using World Products S/R iron cylinder heads with 76cc combustion chambers and 1.6:1 ratio roller rockers. Compression ratio was kept at a relatively low 9.1:1 with hypereutectic pistons from Federal Mogul swung on 5.700-inch connecting rods. Edelbrock supplied the cam and intake manifold, but it took Tom Miller from Turbo City to program a custom PROM chip to get the 383 to even come close to running right. Miller is building a Vortec head TBI 383 that uses the new GM Vortec TBI intake, and a 454 throttle body and injectors that will work with the factory ECM and his custom chip. Does 330 hp and 450 lb-ft of torque sound good? If you want to go any higher than that you will have to add injectors as the 75 lb/hr units for the 454 become the limiting factor. View Related Article
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