carb size for 512 stroker?

JamesRR said

There are no bad roller cams out there, just mis-used ones. What valve springs are you running on the cam? Who's lifters are you using (part #?) and what do they recommend for pre-load? What pre-load are you using? What is your oil pressure at rpm?




Your stock Stealth head flow will limit you to a horsepower peak at about 4400 rpm with a 512ci engine.

Click to expand...

I believe these are my lifters: comp
http://www.compperformancegroupstor...PROD&Product_Code=8921-16&Category_Code=HEHRL

oil pressure is around 70 psi at rpm. I am unsure about the spring set up. I can call my machinist tomorrow.[/QUOTE]

70 psi, that should be sufficient. We are running 72-73 psi.

If you are running the Comp 8921-16 lifters, make sure that whoever is setting the preload follows Comp Cams instructions, [ame]http://www.compcams.com/Technical/Instructions/Files/COMP4-115.pdf[/ame]

It would be good to know the spring pressures. In our case we have chosen to run 155# installed height and 420# over the nose.

Though we have pulled to 6300 rpm successfully, I will have the owner limit the engine to 6000 rpm. This will give him 127 mph in high gear which should be enough for his street car.

AGAIN, A 512 will require more airflow than an unported Stealth head will provide.