Billet Metering Block Standard Calibration fits most 1850, 3310, 4776, 4777, 4778, 4779 Holley® model numbers. Has spark advance provision.
Our billet aluminum metering blocks are machined to very strict tolerances then anodized for protection and good looks. CNC cut from premium aluminum and filled with precision parts, these blocks provide the ultimate platform for your performance carburetor.
Standard calibration for out of box performance - designed to fit most real world street & strip carburetors. Simply add your jets and power valve to complete the installation.
Features:
Adjustable idle feed restrictions - 0.031"
Adjustable power valve channel restriction - 0.053"
3 pre-drilled emulsion channels
Non-stick gaskets
Exclusive QFT positive retaining vent baffle
Stainless steel idle mixture screws with nylon seals.
