Racepak Adapter for Holley ECU SPBL1 Coarse thread bolts have 1"-8

Coarse thread bolts have 1"-8 outer threads while fine thread bolts are 1-1/8"-12

1977-1977 Buick Century

1/8" NPT Female to M16x1

3 in Wheels

Injection Molded for Precise Fit

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