Holley Standard Main Jets . Size 78 # HO122-78 Rate_15 or a big cam engine

or a big cam engine sucking gulps of air

Primary Tube Gauge

and have a maximum pressure of 7 psi with an externally accessible pressure relief valve

8 Rib Crank Pulley

Tall Height

Holley Standard Main Jets . Size 78 # HO122-78 Rate_15 or a big cam engineHolley Standard Main Jets . Size 78 # HO122 78 GENUINE HOLLEY STANDARD MAIN JETS. SALE IS FOR A PACKET OF 2 JETS. Fine tune your carburetor for street or race conditions. These Holley standard main jets are just what you need to fine tune your carburetor for street or race. Threaded for easy installation and removal, Holley jets are manufactured to high tolerances for consistency.