[IROC383]

Hey guys.
After last weekends autox, looks like I don't have much time left on current motor.
In a perfect world. what is the best combo motor application for RR. Whats the typical RPM range I need to build for? I am AIX. By accident I have 3rd gen with T56, C5, brakes, ZR1 11" wheels. So lets build something that will kick some a$$ but have good longevity. Using Iron roller block. Is the Moroso RR oil pan good? I have L31 heads, .512 lift crane hydraulic roller cam, vortec intake and 800DP Holley, 15/8 headers. SRP inverted dome piston and eagle rods. My question is: 383 or 350 ci. Open for suggestions. Going to build this over the Thanksgiving holiday Thanks Jarrod

[Blainefab]

Hey guys.
Whats the typical RPM range I need to build for? I am AIX. By accident I have 3rd gen with T56, C5, brakes, ZR1 11" wheels.

I start by swagging the top speed I'm going to achieve on the tracks that I frequent. If you have an early (.82 5th) T56 then you can use 5th, otherwize plan to limit yourself to 4th. That decision will determine what rear ratio you use, and that ratio, along with your rear tire diameter, will give you maximum RPM. Build the motor to redline a couple hundred rpm higher - if that gets too expensive then rethink rear ratio, or tire diameter.

On the bottom end, with the relatively wide ratio T56, you'll find yourself under 3500rpm more often than you expect, so don't over cam it. More displacement will help here, as will lower total weight.