4500 Open Center Gasket

The MR. GASKET 4500 Open Center Gasket is a precision carburetor base plate gasket engineered for serious performance builders and restoration mechanics who demand reliable fuel system sealing. This composite gasket is designed specifically for four-barrel open-center carburetor installations, particularly those using Dominator flange configurations. Whether you're assembling a high-output street engine, a competition platform, or restoring a classic muscle car with original or modern carb setups, this gasket ensures a leak-free seal between the carburetor base and manifold.

Constructed from composite material and precisely machined to 0.063 inches thick, the 4500 Open Center Gasket provides the structural integrity needed to handle fuel pressure fluctuations and thermal cycling without degradation or fuel weeping. The open-center design accommodates Dominator flange mounting patterns, allowing unobstructed fuel distribution to all four barrels while maintaining port alignment accuracy. This thickness specification is critical—too thin and you risk sealing failure; too thick and you alter carburetor jetting and fuel bowl venting characteristics. The composite construction resists fuel absorption better than conventional cork and holds its crush load across hundreds of heat cycles.

Mechanics and engine builders rely on this gasket when rebuilding Holley 4500 carburetors or equivalent four-barrel open designs with Dominator-pattern mounting. Installation is straightforward—position the gasket between cleaned carburetor and manifold surfaces, torque fasteners evenly in a crisscross pattern, and verify fuel bowl vent clearance before firing. Its compact footprint (6.55 x 6.65 inches) and minimal weight (0.04 lbs) eliminate installation complications. For optimal results, replace this gasket whenever you remove a carburetor; reusing old gaskets invites fuel leaks that compromise engine tuning and safety.