stock pistons and big valve heads
 

can a guy retard or advance cam timing to reduce valve to piston clearence? stock heads and 454 pistons

stock
 

It's a trade off at best.


If you advance the cam, the intake V/P will decrease and the exhaust V/P will increase. If you retard the cam the intake V/P will increase and the exhaust V/P will decrease.

But the 2,25 intake valve will hit before the 1.88 ex will right? So retard it a little it should work right?

stock
 

It really doesn't work like that.

The only way to know is to do a valve to piston clearance procedure on both valves and then determine if it correct clearance exists. Moving the cam just to get clearance may not give you the performance you need.

You can look online on some of the cam company sites like Comp Cams for the correct method. It does require special tools and a good working knowledge of engines to not bend a valve or pushrod during checking.