Phenolic Carburetor Spacer reduces heat rising into the carb to minimize fuel evaporation in the carb and ensure good starting when hot. This spacer
JEGS 555-15444 2 in. Carburetor Spacer for 4150 and AFB Flange Carburetors - JEGS
JEGS 15497: Phenolic Carburetor Spacer With 4150/4160, 60% OFF
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Carburetor Spacer #8715 Divided Center 1/2in Thick For 2-Plane Manifol – Grudge Motorsports
1 Inch Ported Phenolic Carburetor Spacer For Edelbrock Holley SBC BBC Chevy V8 - AliExpress
PHENOLIC 1/2IN CARB Spacer fits For 4150/4160 Bore for Improved Performance $27.01 - PicClick AU
1/2 Phenolic Carburetor Spacer R9139 Replace Open Center 0.5 Square Bore Carb Spacer for Holley 4150/4160 - AliExpress
Holley Edelbrock CARBURETOR SPACER PHENOLIC 1/2 1 2 Open 4 Hole YOUR CHOICE - Simpson Advanced Chiropractic & Medical Center
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Carb Spacer - Dual Vacuum Port – Carb Cheater
Carburetor Spacer 2,0_ Thick, 4-Hole, Square Bore, Phenolic Plastic
Carburetor Gasket, 1 Ported Phenolic Carburetor Spacer 4bbl SBC BBC BB Fits for Holley SB - Yahoo Shopping
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Carburetor Spacer Kit, 1/2in Phenolic Carburetor Spacer Open Center Style Replacement for Holley 4150/4160 Square Bore Carb : Automotive