Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956 [HSD500]

Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956

Ford used the 4000 from 1955-1957, including the Thunderbird and the Police Special which had dual 4000s.

Mercury used the 4000 carburetor in 1956 and Lincoln used the Holley 4000 from 1955-1956.

Rebuild kit to suit the Holley 4000 is HK4005