Holley Main Jets (2) - 63 1341141 Side A is AN-12

Side A is AN-12

5 in Black Ceramic Tips

The Multi Input controller has an easy-to-remove plug covering the programming dipswitches and a programming legend on the back for the 0-5v and frequency based settings

High efficiency

Holley Main Jets (2) - 63 1341141 Side A is AN-12Set of two carburetor main jets. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and