Holley Carburetor Adapter BR20041 Base pressure adjustable from 3

Base pressure adjustable from 3 to 20 PSI with standard spring (installed) or from 20 to 60 PSI with high pressure spring (included)

585" ID that works well with our 985

Hidden-style shim is out of sight above the spring

1992-1992 GMC Typhoon

Holley Carburetor Adapter BR20041 Base pressure adjustable from 3This is a square flange to spread bore adapter. It will allow any Holley model 4150 or 4160 square flange carburetor to be mounted on manifolds that were designed originally for Rochester Quadra Jet or Carter Thermo Quad carburetors. This adapter can also be used in reverse. Pit Stop USA offers Holley Carburetor Adapter 17 6 at low everyday prices. Be sure to check out all of our products from Holley Performance Products including Holley Performance