Sure Seal Spacer 1in

The Sure Seal Spacer 1in from ALLSTAR PERFORMANCE (SKU ALL 25945) is a precision aluminum air cleaner spacer designed for carburetor-equipped engines where intake manifold clearance and cold air intake optimization are priorities. This 1-inch thick spacer is engineered for serious engine builders, street rod enthusiasts, and performance mechanics who need to precisely tune fuel delivery and air charge temperature without fabricating custom solutions. Whether you're working with a classic carbureted V8, a vintage muscle car, or a hot rod build, the Sure Seal Spacer provides a proven way to increase plenum volume and improve atomization in demanding applications.

Machined from high-quality aluminum in a natural finish, this spacer features a 5-1/8 inch carburetor flange diameter and maintains precise 8.05 x 1.2 x 11.05 inch overall dimensions for reliable fitment across multiple carb platforms. The 1-inch thickness strikes the ideal balance between volume addition and manifold stacking height—thick enough to meaningfully increase runner velocity and cool incoming charge, yet compact enough to avoid hood clearance issues or extreme linkage modifications. The Sure Seal design ensures a leak-free seal between carburetor and manifold, critical for proper fuel metering and preventing vacuum leaks that degrade idle quality and throttle response.

This spacer is ideal for tuners building stroker engines, nitrous or supercharged applications where cooler air charge temperatures improve detonation margins, and high-rpm carbureted engines where increased plenum volume supports fuel distribution. Installation requires only removal of the carburetor, gasket replacement, and carb reinstallation with the spacer sandwiched between carb and manifold—typically a 30-minute job for experienced mechanics. Verify carb flange diameter matches the 5-1/8 inch specification and confirm hood clearance before final installation, especially on lowered vehicles or tight engine bays.