1948 1949 1950 1951 1952 1953 1954 1955 METERING BLOCK UPGRADE

Part Number: 34-12

METERING BLOCK UPGRADE - Part Number 34-12
Metering Block Upgrade, 2-Bbl Circle Track Carburetor For 500 CFM 2-Bbl (List 4412) When rules prohibit billet or HP metering blocks to be used with the List 4412 carburetor. This metering block has been modified internally and externally to increase the useable RPM range. GENERAL : Two barrel carburetors used on racing engines offer a unique challenge to teh tuner. Carburetor size restrictions are intended to be an "equalizer" or simply as a means to slow certain classes down. The primary problem is even modestly built engines can easily out-run a small two barrel carburetor. By out-run we mean the engine airflow requirement far exceeds the original design capacity of the carburetor. When that happens, the air/fuel ratio gets progressively richer, robbing horsepower. These modified metering blocks help to correct that problem through recalibration. When compared to a stock unmodified carburetor, these metering blocks add high RPM horsepower by flattening the upper RPM fuel curve.
For 500 CFM 2-Bbl (List 4412) 1948 1949 1950 1951 1952 1953 1954 1955

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