how much does it cost to port a set of heads?
12-07-2017, 02:33 PM
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how much does it cost to port a set of heads? got an lm7 5.3. i was wondering how much it would cost to port, polish, and mill the existing set of heads? and how much of an hp and torque gain could one expect from this mod on an otherwise stock bottom end and valve train, simple bolt ons , and a tune?
