Engine - Block Components - ZL1 Aluminum Big Block

From GM Performance - The Chevrolet ZL1 aluminum big block is back and better than ever. This block was first introduced in the 1969 Corvette and Camaro. It was one of the rarest production engines ever built. Now the improved version is available. This block is based on the original tooling. The new casting is made from 356-T6M aluminum alloy and has a 4.118 cast iron liner that can be bored to 4.300 inch. The bottom end has also been improved with new four-bolt splayed steel main caps, with dowel pins to locate and hod the caps in place.