white1

iTrader: (5)

Yes and No. If you go too radical with lift, you would have to cut valve reliefs in the pistons. I think if you stayed under .600 lift and under .050 or so milling the heads you would probably be OK, but I really am not sure. On my 5.3 I had heads milled .020 and was running .565 lift with the factory pushrods. (I lost all the valvetrain noise with the shaved heads) I didn't have any clearance problems.

1slow01Z71

iTrader: (36)

Or you could justs get forged pistons like me and not have to worry about p to v clearances.
Duration has alot to do with the clearance issues too. If you have a lower duration cam with a high lift you could probably get away with it now take that same lift cam and add 5*s of duration to it and bam your engine is gone. Proper research is the key.

crazyidiot4.8

then do some more research and tell me why the type of piston has anythign to do with p to v clearance....

02sierraz71_5.3

iTrader: (2)

piston is traveling while the valve(s) are open, if the valve is open for longer (more duration) with a higher lift the piston will be closer to TDC hence more duration decreases P-V clearance, then add in certain types of aggressive lobes and they might slightly add to the chance.

white1

iTrader: (5)

Oh yea I forgot to add that. Best way to tell is put it together with an old (compressed) head gasket, and check clerance. A new cam is way cheaper than a new rotating assembly. Or just get in touch with cam motion and tell em what you're doin.

1slow01Z71

iTrader: (36)

Cause in case you didnt know you can get pistons with valve notches cut in them. Why dont you go do some research and you would know.

crazyidiot4.8

you didn't say anything about that though. all you said was "forged"