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On a solid roller, I would never go under 250lbs seat and 500 lbs open and I wouldn't care to run a lot more than that on a billet core.
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Brent:
Just asking, on my race car (331 stroker) I was running a solid roller Comp camshaft, 586 lift and 288 duration, on the cam card they recommended 215 lbs. on the seat, mine were set at 225 on the seat, don't remmeber off hand what the open pressure is...I have a 7,000 rpm chip in it and do run it up to the chip on track....on the dyno we did do a few pulls in the 7500 to 7700 rpm range....the actual hp peaked at 6400 rpms, so no need to rev it much more than that.....
Building a new engine as we speak, same 331 stroker, going with another solid roller, of 624 lift, can't remember the exact duration (haven't got the cam in yet), wanna say around 285 duration.....don't know what they recommend for seat pressure yet, but I'd think anything in the 200 to 225 range would suffice.....
Your thoughts???????
Thanks;
David