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List 1850 is a Model 4160 600 cfm Holley has jets in the primary metering block and a metering plate with non-modifiable orifices on the secondary side.

The primary jets should be a 65 to start...testing at WOT and reading the spark plugs afterwards will indicate if leaner or richer jetting is necessary. Stock accelerator pump squirter should be .025". If some lean stumble off-idle is noted, after verifying proper pump arm adjustment, a .028" squirter can be installed.

View this Holley Page as your gateway to general technical information.
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