![]() The inlet is designed for a 3.5" silicone coupler, with a sealing lip to ensure a leak free installation. These hats feature a 1/8" NPT reference port that can be used as a convenient hook-up for boost gauges or carbureted fuel pressure regulators. The Holley EFI carb hats contoured designed promotes optimal airflow, while providing excellent hood clearance for most applications with a 5-1/8" air cleaner flange. Its looks old school has anybody seen or used one of these with good results. These new carb hats are the perfect solution for any blow through installation. I found a kit for a bbc where the turbo blows into a spacer under the carb. HOLLEY EFI CARB HAT - 4150 CARB HAT, BLACK FINISH, 3.5” OPENING. ![]()
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