barry d.

Have you guys seen any piston to valve clearance problems on a stock engine with these things? I'm going to check when I bolt the heads on the shortblock (454 gen VI) tomorrow but was just curious what to expect. I wasn't sure if these things generally have mountains of piston to valve so nobody concerns themselves with it or if I should be expecting to flycut the pistons. Any feedback?

Smitty

Ran a 731 in a 502 for years. Should not be a problem. And pistons already should have a relief in them.

barry d.

They do have a relief in them, and I'm using stock sized valves but just wasn't sure what people have been getting away with. I guess I will check it tomorrow just to make sure. I just thought someone may have been down this route already and would say, well I saw x amount of lift with y amount of clearance...

Anyways, thanks

Smitty

That cam has .587 of lift on the intake side. You don't need to worry until you are near .700 of lift.

barry d.

Thanks. I actually checked it just to be sure so I'll post the results as I'm sure someone will go down this same route later. I used the standard method...TDC'd the motor and checked 10° btdc and 10° atdc. The intake had .120" and the exhaust had mountains of clearance so I didn't make mental note (over .250"). This is with stock size valves and stock longblock. Hope it helps...