GMC_C15v8

ok i have a 1977 c15 that has a rebuilt 350 jasper and th350 tranny. im guessing no more than 200hp is being produced now. so my question is with 5 grand (for parts only) to modify the engine how much horsepower will i gain (im thinking about 500hp)? what maximum rpm do you guys recommend 5,500 or 6,500? im planning to keep the same gear.please can you guys list the names of parts.
thank you

laman

To use 6500 rpm you would need more gear. I had a monte ss that I built a 383 for shifting at 5800 rpm running high 11's at 112 in quarter. I was using stock 373 gears...

GMC_C15v8

yeah im planning to change it to 3.73 or 4.10 but how about the engine i know i need a new cylinder head 67cc or 64cc, crankshaft, camshaft, pistons, push rods, exhaust manifold, carburetor 800 cfm, valve springs. i just need to know the correct sizes.

laman

I ran a lunati cam with matching spring and lifters.Match cam to what rpm your going to be turning. It doesn't have to be lunati any name brand cam that matches your application will work. 67cc aluminum heads. flat top keith black pistons. I ran a 700 cfm holley carb. You can definitely go to big here if you don't watch out. A set of hooker headders.