GM Performance Parts As far as crate engines go, this is the one that might have started it all. The ZZ4 350 Turn-Key crate engine has a forged steel crankshaft, hypereutectic pistons, hydraulic roller cam and aluminum cylinder heads. The ZZ4's Corvette-derived high-performance heads feature high velocity intake runners and D-shaped exhaust ports to promote efficient and unobstructed flow through the engine-providing strong power and torque at all rpm levels. It is delivered with an aluminum dual-plane intake manifold, HEI distributor, cast iron water pump, damper, flexplate, an accessory drive package, fuel pump, chrome air cleaner kit, Holley 750cfm carburetor, starter, and spark plug wires. The ZZ4 comes to you with a full 355 hp and 405 lb-ft of torque.
On the LS side, the LS7 features a unique big-bore cylinder block that is anchored with a forged crankshaft, titanium connecting rods, and friction-coated pistons. But it's the airflow capability of the LS7's cavernous, CNC-ported heads that enables its 500 naturally aspirated horsepower and 470 lb-ft of torque rating. Large-volume, straight-passage intake runners channel air directly around 2.20-inch titanium intake valves. The mixture is burned in large, 70cc combustion chambers and what's left exits through 1.61-inch sodium-filled exhaust valves. GM Performance Parts' LS7 7.0L crate engine package includes a production-style engine with the dry sump oil pan, manifold assembly with injectors, electronically controlled throttle body, and log-style exhaust manifolds.
GM Performance Parts' recreation of the classic L88 big-block combination, now called the ZZ427/480, rated at 480 hp. Like the original, it features an iron block, forged steel crankshaft, and high-flow aluminum cylinder heads. GM upgraded the camshaft from the original's mechanical flat-tappet design to a more contemporary hydraulic roller, giving this 21st-century L88 modern drivability characteristics and a greater rev range. A lower 10.1:1 compression ratio lets it live on pump gas. The ZZ427/480 comes complete with high-flow oval-port heads, a high-lift camshaft (0.510-inch intake/0.540-inch exhaust), an aluminum intake manifold, 870cfm Holley carburetor, an HEI distributor, aluminum water pump, balancer, spark plug wires, and a 14-inch flex-plate.
Back in the day, the big daddy of all GM powerplants was the all aluminum ZL1. Not many were made and who knows how many even survived. Luckily, you still can be a part of muscle car history by picking up one of these aluminum Anniversary 427s. That's right GMPP is cranking out a limited number of these lightweight big-blocks. The Anniversary Edition 427 starts with a new version of the ZL1 aluminum block using the exact same tooling used back in '69.
The aluminum 4-bolt main block is filled with a forged steel crank, forged rods, and forged aluminum pistons for a 9.5:1 final compression ratio. Aluminum, oval port heads have a 110cc combustion chamber and carry 1.7:1 aluminum roller rockers, 2.19-inch intake and 1.88-inch exhaust valves. A matching, high-flow aluminum oval-port intake feeds the heads with the help of an 870cfm carburetor. The camshaft is a hydraulic roller with 0.510-inch of lift on the intake and 0.540-inch on the exhaust. Like the original ZL1, the Anniversary 427 comes underrated at 430 hp. Only 427 of these crate engines were produced before the ZL1 tooling was retired forever and according to our contact at GMPP, not many are left.