Here's our finished and upgraded ZZ502 crate engine. The supplied aluminum Bow Tie dual-plane intake, Holley 850 CFM carb, harmonic damper, and HEI distributor top our long-block. Since our dyno uses an electric water pump, we didn't bother putting on the aluminum GM unit. We also found that the ZZ502 valve covers were just barely hitting our new COMP rockers. To clear, we would either have to double up the gasket or swap to a taller valve cover.