1in Phenolic Blended 4-Hole Carb Spacer

The CANTON 1in Phenolic Blended 4-Hole Carb Spacer (MPN 85-158) is a carburetor riser engineered for street and strip applications where intake manifold clearance, fuel distribution optimization, and plenum volume tuning are critical. This spacer sits between your carburetor and intake manifold, serving dual roles: it creates physical separation to prevent hood interference on lowered vehicles or tight engine bays, while simultaneously improving air charge distribution and fuel atomization by increasing runner residence time.

Constructed from phenolic composite material, this 1-inch thick spacer delivers superior insulating properties compared to aluminum, reducing carburetor heat soak and fuel volatility—especially valuable in high-ambient or engine-bay-intensive builds. The square-bore, 4-hole pattern accommodates Holley-style 4150 carburetors and compatible units, with precision-machined bolt holes ensuring zero leak paths at the carb-to-spacer and spacer-to-manifold interfaces. Weighing just 1.02 lbs, the phenolic construction also minimizes parasitic weight while maintaining rigidity under thermal cycling and vibration.

Fabricators and tuners rely on carburetor spacers to fine-tune induction dynamics on small-block and mid-size V8 engines, particularly in muscle car restorations and vintage drag racing platforms. The phenolic blended design is ideal for carbureted street rods, competition hot rods, and classic truck builds where heat management and repeatable air-fuel mixture quality drive reliability and performance. Installation requires only standard 4-hole carburetor bolts and a gasket set; spacer height allows safe clearance under most factory and aftermarket hoods. Verify intake manifold bore diameter and carburetor base flange compatibility before ordering.