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Believe it or not .020" is a typical amount to straighten a head.

I'm confused though, the deck was off by .003" but the cam bores were off by .020". Seems to me that if that was caused by the previous owner the cam bores would be wiped out.

Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...