Loading... Please wait...These are a meticulously designed exact copy of the original Holley 2x4 Vacuum Secondary Tops (HLY 20-28) used on 60's vintage Holley Dual 4bbl setups for car and truck carburetors. This product was designed by Holley to improve the synchronization of the vacuum secondaries on the dual quad setups.
ONE PAIR INCLUDED
There is a limited supply, so get them while they last!