Fits Small Block and Big Block Chevrolets. Introducing the next generation of Holley EFI Dual Sync Distributors, the new design features an improved shutter wheel, high-quality dual Hall Effect sensors, and an MSD cap and rotor!
Nicely made , easy to install , performs flawlessly . I used the dual synch on my Gen 1 sbc to control the LS coils near plugs and sequential fuel injection with a Holley Dominator ECM at the heart of my set-up.