[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

[Casey_SS]

Sounds like you already have most of the parts you need for a 300ish hp motor. For that head / cam combo, definitely go 350. A 383 or bigger will make the same hp but at a lower rpm. The small amount of torque you'd gain isn't worth the loss of rpm range IMO. Also, an 800cfm carb is WAAAY too big for this combo...sell it and get a 650ish model. The Demon carbs are really nice if funds permit....

Invest in some Plastigauge and good books....pay very close attention to both static & dynamic compression ratio, quench area, bearing clearances, etc. Have a good machine shop balance the rotating assembly and prep the block.

Or - as Mitch mentioned - save yourself a bunch of time, money and potential headaches via a crate motor or long block from a reputable source. Really takes the guesswork out of the equation and you pretty much just buy as much power as you can afford. Especially if this is the first race motor you've built....takes most people two or three shots at it to learn all the "tribal knowledge" details and assembly tricks that go into a reliable track motor.