Quote:
Originally Posted by mgarblik
The TRW SD pistons have drilled oil drain holes, not the typical open long slot like most cast pistons and some 4032 alloy forged ones. I don't have them handy right now but possibly 3-4 holes on each side about 5/32" each. Not sure about that.
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That would explain why the SD455 needed so much piston to skirt clearance. That skirt design expands a bunch.