I have a question about calculating (or anticipating) piston/valve clearance issues. While waiting for my short block build, I picked up a set of 264/272 cams, and a built head with 2mm oversize valves. I wasn't looking for bigger valves, but as I was ready to buy parts for rebuilding my stocker, I came across this other head for a good price. Lately I started wondering if I'm going to have an issue with clearance. So I guess for starters, my question is whether anyone has ran these cams with big valves? What do the aftermarket pistons do to valve clearance over stock pistons? I've been studying Jafro's Hyundai motor video where he notches the pistons to allow him to use the cam timing he wanted. He's advising not to thicken the head gasket for more clearance. So I guess I'll follow his procedure if needed. But if this combination is known to leave the standard .080"/.0100" clearances (which I'm doubting) then I'll stop worrying about whether I should be rethinking my build...or buying some solid lifters, softie valve springs and degree wheel, etc. Here is what I'm working with now:
Evo8 lifters and rockers(1.7x:1 ratio...same as ours I think?)
stock crank (88mm)
pauter 1G (150mm) rods
wiseco 1G 9.0:1 pistons .020" over
Deck cut? I don't know yet.
Head planed? It was finished for MLS HG but I don't know how much material was removed. Can I measure this and compare to an uncut head casting?
Thanks all for any info!