We’re back with the final installment of building Chevrolet Performance’s all-new, 1,004hp ZZ632 crate engine. Previously, we detailed the short-block buildup, including the installation of its hydraulic roller camshaft.
Focus now moves to the top end of the electronically controlled, port-injected, crank-triggered monster big-block, starting with the heads. For that step forward with our story, however, we need to step back in time to the mid ’80s.
That’s when GM engineer Ron Sperry pushed up the sleeves on his Members Only jacket and got to work on a unique spreadport, straight-flow cylinder head that was intended for the Pro Stock wars. The design was a winner, with off-the-chart airflow capabilities, but by the time the first few sets of heads were cast and offered to racers, in 1988, NHRA had…