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#20: 06-05-2010, 09:41 AM
GTTuner's Avatar
Title: Whut, who me?
Rank: Donating Member
Location: Rhode Island nation of taxation
Car: Tuned for torque!
Posts: 6,675
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From the heads I have taken apart the exhaust valve's and seats seem to take quite a beating. One motor, with 115,000K needed the seats cut and the valves ground to restore the margin, and my 83,000 mile motor needed quite a bit of lapping to get the seats cleaned up.