Re: ZL 1 #69
I will double check this but I believe the NHRA made the race cars #51-69 switch to iron blocks after Lamar Walden beat the class record in Gainesville, FL by around a second right out of the box. That is, after the head problems were solved. I'm not sure any of those racers were thinking about collector value but rather trying to make ends meet from week to week.
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