ARP Rocker Arm Nut - 3/8-24 in Thread - 0.550 in Shank Diameter - 1.200 in Long - Chromoly - Black Oxide - Aluminum Rockers - Set of 16 R0400034XL Performer 351-4V is designed for

Performer 351-4V is designed for street 351C and Boss 351 Fords that came stock with 4V carb and heads

2-7/8 in Pin 5x5 Hubs

1-1/4 in Mandrel

and Air Plugs in Three Adjustable Inlets on Top and Both Sides of chin bar for the most adjustable Air Flow in the market

ARP Rocker Arm Nut - 3/8-24 in Thread - 0.550 in Shank Diameter - 1.200 in Long - Chromoly - Black Oxide - Aluminum Rockers - Set of 16 R0400034XL Performer 351-4V is designed forA rocker arm adjuster that doesn't require special tools and won't work loose. Threads on the heat treated Perma Loc Adjusters are machined exactly perpendicular to the adjuster bottom. a set screw is also machined flush on the bottom. All of these features help eliminate setting valve lash on a regular basis. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Rocker Arm Nut 3 8 24 in Thread