Piston to valve clearance?

[Ted]

What kinda of piston to valve clearance should there be on a production block with production heads?

Could there be a potential problem with over a .500 lift cam and a decked head?

Thanks...

 

[Mike Licht]

What kinda of piston to valve clearance should there be on a production block with production heads?

Could there be a potential problem with over a .500 lift cam and a decked head?

Thanks...

How much over we talking .505 or .595?
Mike

 

[87GN_70GS]

It's not max lift that causes interference, it's duration. When the cam is at max lift (usually around 104-108 deg ATDC) the piston is some 2 inches down in the cylinder. If you have 2.0 inches of lift or so, then yes that would be a problem.

 

[Louie L.]

Ted,
If the heads are stock and untouched , the valve guide to retainer clearance should be checked. I would be more concerned with this if the heads are stock than with the valve to piston clearance.

 

[Ted]

Ok, guys good stuff. Thanks for the info. Trying to build a motor for the first time and just want to ask all the stupid questions up front.

It sounds like this is not really an issue with these motors?

Anyway what kinda of piston to valve clearance should I look for? .060-.070???

Thanks