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I have to give the size for my forged piston upgrade and I was wondering if anywhere on the stock pistons it has the size stampped so I can be sure that it wasnt overbored at the last rebuild 30k ago?
 

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Brian - no they usually aren't stamped with the size. Take one to a machine shop and have them micrometer it to tell you the size (I'll be stock). Or you could micrometer the bores (usually how it is done).
 

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The stock bore is 91MM. But depending on which pistons you buy, you havta know the clearances before you bore.

My Ross's need a .0006 thousandnths clearance.
 

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You know the Mitsu Engine Overhaul Manual is available for <B>FREE</B> on the internet courtesy of Vinny Singh.

http://www.twingles.com/manualcd/dsmgift/

Pokey,
Do you mean 0.006"? Less than 0.001" is very rare (and unsual) for forged pistons. The stocker cast pistons want like 0.0008 - 0.0016". My venolia want 0.005". Also, stock bore is 91.1 mm (3.587") - according to the overhaul manual.
 
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