Small-Block Geometry, No GM Parts Tom was quick to note that this is not a GM engine block. It merely shares some key geometric dimensions with the iconic and quintessentially American V-8. But ...

The MMR Gen X billet engine block features custom cylinder sleeves with a flange on top for added rigidity. The bore is 3.700 inches and the pistons are custom Manley forged ones with an ...

"They just laughed," Morris says. "At first they thought it was a joke." Next up was the engine block itself, which started out as one giant, 48-inch-long billet that cost $13,000.