Re: Piston clearance spec for rebuild

Posted by PackardV8 On 2012/5/31 21:11:37

Follow the piston supplier recommendations.

To double check:
IF u have an OEM piston (one that is getting replaced) then place both the old piston and the new piston in the oven at about 250 degrees F. Measure the variation in expansion.

BE SURE TO MEASURE FOR GUDGEON PIN OFFSET (if any)!!!! I have no specs for offset for this particular engine. U'll have to find those elsewhere.

Bottom line: Compare NEW piston to piston that is getting replaced!!! Check for wrist pin offset (if any).

Look at the CHAMPFER on the OUTER circumfrenece of the old piston VS new piston. There can be variations in champfers from piston to piston and it's not a major issue unless excessive piston/cylinder clearence is needed.

Are u boring the block and replacing with oversize pistons??? What is the oversize??