3.4 L piston upgrade help
 

need help I purchase a set of 3.4 l piston and on the bill of sale it state that . angle and chamfering modification to heads is needed.but when place on heads seems to be a perfect fit ,am i missing something please help

With modeling clay or soft solder on piston crown, check piston-to-head clearance and piston-to-valve clearances, then adjust accordingly. Use cylinder 1 with head, cam and a couple of rockers installed, then tell your Porsche machine shop what you have. While you're at it, determine true TDC and mark your pulley before beginning.

Sherwood Lee
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