Under head length is 3.75 in. These attach a Chevrolet motor mount to the frame stand on 1972 and earlier vehicles where the rubber mount is on the engine and the frame stand is steel.
ARP Motor Mount Bolt Kits
ARP rugged motor mount bolt kits come in your choice of black oxide finished chromoly or corrosion-resistant stainless steel. You may also choose standard hex head or compact 12-point fasteners. Each kit comes complete with flat washers.