Chev LT1 6.2L ARP Timing Cover Bolt Kit Hex Head # 434-1506Chev LT1 6. 2L ARP Timing Cover Bolt Kit Hex Head # 434 1506 The world leader in fastener technology has just released four new timing cover bolt kits for Small Block Chevrolet 6. 2L (LT1) applications. These kits are nominally rated at 180,000 psi tensile strength which is substantially stronger than grade 8 hardware and offered in 15 piece packs to accommodate the newly released 6. 2L (LT1) Chevrolet engines