Chev BBC 396 427 454 502 Chevrolet ARP Intake Manifold Bolt Kits # 135-2001Chev BBC 396 427 454 502 Chevrolet ARP Intake Manifold Bolt Kits # 135 2001 Bolts, Intake Manifold, Chromoly, Black Oxide, Hex Head, Chevy, Big Block, Kit Thread Size: 3 8 in. 16 Washer Included: Yes Head Style: Hex Fastener Style: Bolt Fastener Color: Black Fastener Material: Chromoly Quantity: Sold as a kit. Notes: Big block Chevy, underhead length 1. 250 in. ARP Chromoly Intake Manifold Bolt Kits ARP rugged, black oxide coated chromoly intake