View single post by Jensen Healey
 Posted: 11-16-2013 03:51 am
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Jensen Healey



Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
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 The forged pistons expand less than the stock cast pistons. Sorry I don't have documentation but I had my liners bored .030 over by Barry Spencer. He pulled the liners and used a custom jig to hold the liners during the machine work. They came back super clean on the outside so cooling isn't an issue.

I bought .030 over JE pistons from Delta. No problems in 15,000 miles.

The stock bore is 3.75" so the bore should be 3.78". I would trust JE and ignore stock clearances. They have been making pistons for the 907 for a long time.

Kurt