Sound like bad news. The turbo does not beat up the pistons/ rings. Lean, hot mixtures with too much timing cause detonation. You may have cracked a piston ring land or broke a ring. Maybe more than 1 piston is affected.
Does it miss?

Do you have any video of it running/ driving? Show us what it did with boost.

Last edited by tlowe #1716; 02/28/12 11:03 PM.

Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
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