AED 1" Birchwood Carburetor Spacer - Standard Holley R01J003S Lightweight DOT approved cylinder and

Lightweight DOT approved cylinder and head combination

High conductivity

Zamp's Snowmobile Balaclava

1994-1997 Pontiac Firebird

AED 1" Birchwood Carburetor Spacer - Standard Holley R01J003S Lightweight DOT approved cylinder andAED Carburetor Spacers offer many distinct advantages that are worth mentioning. 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. Results on the dyno of up to 20 horsepower. AED originally designed these spacers for racing but soon found out