Seller notes

AED 6155 1/2" Birchwood Rochester Quadrajet / Spreadbore Holley Carburetor Spacer Open Center AED Carburetor Spacers offer many distinct advantages: Besides traditional tuning changes in plenum volume which can improve torque and power output, Birchwood is a great thermal barrier. By keeping fuel bowls cool you get a noticeable increase in fuel density, resulting in a better charge available for combustion AED has seen results on the dyno of up to 20 horsepower using these spacers AED originally...

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