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Post: 402 Big Block Bored 90 Over?

motorman
Super Senior Member
Posts: 5017

Loc: south western pa.
Reg: 01-25-00

06-12-12 12:03 PM - Post#2236240
In response to Quik 71 SS

Quik 71 SS Said:

I have a 402 Big Block that decodes as a replacement block (71 Model).After teardown the pistons are 6o over.One cylinder will not clean up so the Machine Shop says they can bore it 90 thousandths.I was under the impression that you couldn't bore a block more than 60 without causing problems.Does any one have any input?Can it be bored 90 without causing problems???

i would check on custom made pistons in .065 over if that would clean up the bores.

retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way

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