Description
Holley Aluminum Secondary Metering Block is a die cast aluminum block that has threaded idle feed restriction and machined is for 4 corner idle. There is NO provision for a power valve on this metering block. The metering block will come with .031″ idle feed restrictors installed, but you can purchase additional restrictors to set the block up however you like. This block is machined for a double pumper carburetor, but will work on both mechanical and vacuum secondary carburetors. PLEASE NOTE JUST CHANGING THE SECONDARY METERING BLOCK DOES NOT MAKE A CARBURETOR 4 CORNER IDLE. When converting a carburetor from 2 corner idle to 4 corner idle, both the main body and baseplate need to be machined along with changing the secondary block.
