Header Bolt Kit For Chevrolet 3/8˝ wide header flange Stainless Hex Head

Header Bolt Kit For Chevrolet 3/8˝ wide header flange Stainless Hex HeadARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The ARP Stainless material is not affected by corrosion or extreme heat, making it ideal for the pplication. Whats more, the compact 12 point inut lets you easily slip a socket close to the pipe. Studs are manufactured with a unique nut starter nose that helps prevent cross threading.

As the crankshaft flexes and twists

with threads rolled after heat treat to ensure the optimum fatigue strength

Finish: Polished

L19 is a very high strength material compared to 8740 and ARP2000 and is capable of delivering a clamp load at 260

Finish: Alumotef

These pump drives feature a CNC milled (not broached) hex

Studs are preferred by many Pro engine builders because they eliminate the chance of pinching gaskets and contribute to easier engine assembly

or using a spacer for clearance

all ARP 12-point nuts are constructed from 8740 chrome moly steel or ARP Stainless

The high cobalt content of this alloy

the shaft diameter is a larger diameter than the OEM unit

but the results are well worth the extra effort