![Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956 [HSD500]](https://classiccarbs.com.au/image/cache/data/Holley/Holley%20Parts/900_HSD500-Holley-4000-diaphragm-2--500x500.jpg "Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956 [HSD500]")
![Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956 [HSD500]](https://classiccarbs.com.au/image/data/Products/Holley/900_HSD500-Holley-4000-diaphragm-3-.jpg "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
Holley 4000 Secondary Diaphragm Thunderbird Mercury Police Special 1956 [HSD500]
- Brand: Holley
- Product Code: HSD500
- Availability: 3
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$79.00