![]() We wondered how much more power we could get from swapping to GM's bottom-dollar Vortec cast-iron head, and also their new "Fast Bum" aluminum heads. To complement the cylinder head design, GMPP incorporated a steel roller tappet camshaft with. The valve seats are radiused and include valve stem seals to help keep the oil where it belongs. Also included are lightweight valvespring retainers that weigh half as much as the previous design. ![]() The aluminum angle-plug cylinder heads have screw in rocker studs, 1.94-inch intake and 1.50-inch exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10:1 compression ratio. Topping the ZZ4 is the aluminum L98 cylinder head that was available on the pre-LT1 Corvette. The engine arrives with an intake manifold, HEI distributor, and many of the little details crate engines normally ship without. The retail price of just over $3,000 makes it an affordable, reliable, and available performance engine with a 12-month warranty. The ZZ4 has a nice combination of features, including 355 hp and 405 lb-ft of torque. ![]() We decided to look at the cylinder heads offered by General Motors Performance Parts (GMPP) on the most popular of their small-blocks, the ZZ4 350. The fair prices, nationwide availability, and serious horsepower produced by these engines have made them the preferred choice of street rodders and racers alike. ![]() General Motors really hit a bullseye with their series of "ZZ" smallblock Chevy engines. Testing the three best small-block Chevy heads from GMPP ![]()
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