.035 is normal for a point-type ignition. .045 is what's recommended for an HEI system.[.50 is half an inch]
I/I #4101 '71 GMC Jimmy 350, sm465, np205,3.73 posi. '68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi. '67 K/10 454 project. '72 K/5 rolling frame project.
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