F.A.S.T. FireBall HI-6S Ignition Box FAST - Fuel Air Spark Technology They feature an O-ring design

They feature an O-ring design for an improved seal

Please check as follows: Original stud length (i

Fully EGR compatibleBD Diesel Performance is unique among its peers in that it designs

Designed with

1963-1967 Chevrolet Chevy II

F.A.S.T. FireBall HI-6S Ignition Box FAST - Fuel Air Spark Technology They feature an O-ring designFor computer controlled cars trucks without vacuum advance. Triggers from stock electronic ignition. Easy Plug n Go installation. Not compatible with distributorless ignitions. 50 states legal CARB E. O. , D 225 59. HI 6S Multi Spark IgnitionNew! Plug n Go installation for 4, 6, 8 cylinder with distributor Up to 70% more spark gap energy than stock ignitions! Max output up to 8, 000 RPM for up to 9. 5: 1 comp. ratio! New! Soft urethane encapsulation