Chevy ZZ502 Short Block YSI Supercharger Upgrade - V Is For Power!

This is the same ZZ502 short-block we used back in the June '08 issue. We didn't change anything, just cleaned it up before bolting on the Dart top end.

We reused our Comp Cams' Endure-X lifters. It's important to mention that the Gen VI short-block requires a 0.300-inch-taller body lifter, and these can be had under PN 866-16.

Given the boosted environment we were going to subject our ZZ502 to, we used a set of Fel-Pro 1075 MLS head gaskets. The multilayer steel design will fight increased cylinder pressure and help prevent potential blown head gaskets.

In the past, we've taken a pretty detailed look into Dart's CNC Pro 1 335s. What we learned was that they flow like mad and come with a rather robust spring package, perfect for this month's test.

Topping off the heads is a matching Dart single-plane manifold and a complete set of Comp Cams 1.7:1 Pro Magnum roller rockers. For pushrods, we used Comps 3/8-inch-diameter Hi-Tech pushrods, measuring 8.400 inches on the intake and 9.400 inches on the exhaust.

Functional is good, but if you want eye candy too, it's tough to beat Moroso's fabricated aluminum valve covers. Moroso offers a wide variety of applications and options; ours included thick billet rails for improved sealing along with a tall design to clear most rocker combinations-even stud girdles, should you have them.