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Re: Weird - Oil ring pops out of groove while running on dyno
If the bore mic's out O.K. about all I can think of is the ring expander or the oil groove is miss-machined in the piston.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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