Phenolic 1in 4500 Spacer Open Spacer

The CANTON Phenolic 1 inch 4500 Spacer Open Spacer (MPN 85-200) is a precision carburetor spacer designed to elevate intake manifold geometry and optimize fuel-air mixture distribution in high-performance small-block and big-block engines. Built from phenolic material, this 1-inch open spacer features a Dominator flange configuration and delivers thermal isolation between the carburetor and intake manifold, reducing heat soak and fuel vaporization during sustained acceleration and high-load driving scenarios.

Phenolic construction provides superior insulation compared to aluminum spacers, maintaining cooler fuel charge temperatures critical for carburetor calibration stability and engine responsiveness. The open design allows unrestricted fuel and air passage without internal baffles or restrictive geometry. At 1 inch thick, this spacer raises the carburetor mounting point to improve hood clearance on modified engine bays while increasing plenum volume for enhanced low-end torque delivery. The natural finish requires no additional coating and resists fuel and oil degradation over extended use cycles.

Street performance builders, bracket racers, and engine rebuilders rely on carburetor spacers to fine-tune intake temperatures and breathing characteristics when upgrading to larger cfm carburetors or modified manifold combinations. The Dominator flange pattern accommodates a wide range of Holley and compatible carburetors commonly used in hot rod, muscle car, and circle-track applications. This spacer addresses a fundamental thermal and tuning variable that directly impacts cold-start behavior, part-throttle response, and steady-state cruise efficiency.