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im4duke im4duke is offline
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Join Date: Jul 2005
Location: Columbus, OH
Posts: 650
Machine valve pockets/reliefs in stock pistons?

I am rebuilding my 3.3 turbo engine and using new Mahle C2 Turbo pistons & cylinders. One builder suggested that I machine reliefs in the pistons to insure against piston/valve contact. I will be purchasing upgraded valve springs as well, though have not yet decided whose to buy. I forget what he quoted to do this work. I know it is common on aftermarket pistons. Any opinions on whether I should do this?

Incidentally, a bent exhaust valve is what ultimately led to this rebuild...
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86 Ruf'd and rebuilt (sold)
Old 05-04-2009, 06:19 AM
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