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Coarse thread bolts have 1"-8 outer threads while fine thread bolts are 1-1/8"-12
and handling application
Injection Molded for Precise Fit
3 in Wheels
Racepak Adapter for Holley ECU SPBL1 Coarse thread bolts have 1"-8Racepak Adapter for Holley ECU Racepak LLC was founded in 1984 by Spencer Eisenbarth and Ron Armstrong, originally as Racepak and its parent company, Competition Systems, Incorporated (CSI). Both men were engineers with strong backgrounds in electrical and mechanical applications, and both had an interest in motor sports. Through an earlier joint effort aimed at obtaining data for the improvement of the Unlimited Hydroplane that Armstrong was piloting
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