ARP Chromemoly Header Bolt Kits 3/8 in.-16, 1.000 in. Chev Ford # 100-1209 Rate_12 Cylinder heads feature a

Cylinder heads feature a

Please see the charts and guides tab for a comparison of square bore vs spread bore

From the base gasket to the air cleaner ring gasket and everything in between

Allow engine to cool and re-tighten all header bolts

Kit # DER-15721

ARP Chromemoly Header Bolt Kits 3/8 in.-16, 1.000 in. Chev Ford # 100-1209 Rate_12 Cylinder heads feature aARP Chromemoly Header Bolt Kits 3 8 in. 16, 1. 000 in. Chev Ford # 100 1209 Fastener Style: Bolt Thread Size: 3 8 16 in. Head Style: 12 point Underhead Length (in): 1. 000 in. Underhead Length (mm): 25. 00mm Fastener Material: Steel Fastener Finish: Black oxide Quantity: Sold as a set of 12. Notes: 170,000 psi tensile strength, 5 16 in. wrench.