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FREE SHIPPING lower 48 states . Here we have a original set of Vintage standard bore GM/ TRW 3906648 closed chambered 12.5 to 1 compression from a 1967 427 L-88. Dad purchased the shortblock new from Chevrolet parts in 1973 over the counter. These pistons were balanced before running in a blueprinted engine. Only 11,000 miles on these. Barely any carbon on the polished domes. 1/16, 1/16 ,3/16 ring sizes.others on selling for twice the price I'm asking. NOS quality.....See other items