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• Phenolic adapter allows Holley 2-barrel carburetor (R4412) to be installed on a stock GM 2-barrrel intake manifold
• 1" thickness
• Comes with all necessary hardware & has Heli-coiled threads

• 1" Phenolic adapter allows #R4412 2-barrel carburetor to be mounted on 4-barrel manifolds that have standard Holley bolt pattern
• Spacers are adjustable front to rear for fine tuning
• Comes with all necessary hardware & has threads that are Heli-coiled