Holley Main Jets (2) - 58 931021 lock angle and 3/8" valve

lock angle and 3/8" valve stem size

absorbing the numerous machining tolerances that exist in our "non exact" world

optimized port and chamber design

Rotationally Molded Polyethylene

Hammer Console Shifter

Holley Main Jets (2) - 58 931021 lock angle and 3/8" valveSet 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