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643 Posts
i have the skunk2 valvetrain, and i've been well over 9k 
when the head was stock i shifted at 8k all the time at 10 psi and it held up. but i'm a crazy asshole :lol:
when the head was stock i shifted at 8k all the time at 10 psi and it held up. but i'm a crazy asshole :lol:
