I have seen motors with the best parts (All New) fail on the dyno and on the other hand I have seen many motors with used parts through out still running strong after 500+ passes
Don't think it was a mistake from the builder, just think a part let-go.. Hate to hear it happened, but that is racing..poppaj

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AA/NSS 65'Coronet "Whompin Wedge"
Pop & Son Performance 557" B-1 power
John Holt Chassis