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Re: 6.0 w/ 317 heads
you can mill .030 or .040" off until intake fitment gets a little hokey.
if untouched, they should be 71cc like Warren pointed out
no LS engines came w/ 8.3:1 compression
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71 C10 long bed, 2003 6.0L, 06GTO E40, T56, 12bolt 4.10 rear
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