Holley 121-137: 121-137 Straight Nozzle Hole size .037"
Straight Nozzles *For 4150/4160/4500 carbs
Straight Nozzle Hole size .037'' Hollow nozzle screw NOT included
Straight Nozzles *For 4150/4160/4500 carbs
Straight Nozzle Hole size .037'' Hollow nozzle screw NOT included