427 stroker build

[CHRIS DAMSCH]

Bob,

What is the rest of your combination(heads, cam specs, intake, comp. ratio)? Can you post your chassis dyno sheet? Or maybe some hp and tq #'s at different rpms.

Thanks,

[bobcowan]

Originally Posted by CHRIS DAMSCH

Bob,

What is the rest of your combination(heads, cam specs, intake, comp. ratio)? Can you post your chassis dyno sheet? Or maybe some hp and tq #'s at different rpms.

Thanks,

I thought about more stroke for this engine. 455 cubes is pretty easy. But I like to beat on it pretty hard on the road course. So the shorter stroke will last a little longer. It's a trade off. If I was building a strictly street engine or maybe an occasional drag motor, I'd probably go for the longer stroke. Too much is just about right.

I'm using Dart Pro-1 heads. The runners are smaller than most aftermarket heads. But - in theory - they flow well enough as is. And they're cheaper. I port matched them to my intake. Otherwise I left the ports and chambers alone. I did use Comp Cams beehive springs.

The cam is a Hydraulic retrofit roller from Coast High. Basicly, the biggest one the sell. .595/.605, 294.298. It starts to break up at about 6,300 rpm's. Valve float I suspect. I think next year I might go with a solid roller cam for more rpm's.

I have 10.8 static compression. But I live at 6,400' ASL, so cylinder pressures are pretty managable; especially with such a big cam. On the street I run mid grade fuel without any problems.

The intake is a Momar EFI 8 stack system. By looking at the dyno chart, there dosn't seem to be any problems with air or fuel delivery. If I can get more rpm's in there, I think it will run just fine. I don't think the intake or heads will be restrictive. We'll see.

[427supr]

The Victor Jr. is fine. I thought the dual plane gave you better low end torque at lower rpm's and the single plain gave you more HP on the higher rpm's. My engine builder believes that a smaller carb (750) runs better on the street than a bigger (850). Bigger is not always better. Some guys over carb, but I will talk to him about it. I personaly would rather run a (850). My engine builder is hard to argue with because he works for a well known engine builder that builds nascar engines for winning teams.