Chevrolet Performance ZZ632/1000 Deluxe Long Block Crate Engines 19432060

At 632 cubic inches, the ZZ632/1000 tops Chevrolet Performance's naturally aspirated big-block lineup, with 876 lb-ft of torque backing a 1,004-hp peak and a 12.0:1 compression ratio. RS-X aluminum cylinder heads and a hydraulic roller camshaft sit atop the long block, fed by a fuel-injected intake manifold and a 4500 Dominator-style throttle body.

What ships assembled

Valve covers, timing cover, oil pan, harmonic balancer, spark plugs, and spark plug wires all arrive installed, along with the computer and wiring harness for the EFI system and a 14-inch internally balanced flexplate for automatic transmissions; a manual gearbox needs its own internally balanced flywheel. A short-style water pump handles cooling.

What this build still needs

Chevrolet Performance notes this engine needs a high-pressure EFI-compatible fuel pump, a starter, and an air cleaner with a 4500-style flange, none of which are included, plus a custom exhaust system because of the RS-X cylinder head port design. It is not emissions-certified and is built for off-road or racing use only, and the maker specifically notes it is not intended for marine use. Premium 91-octane-or-higher fuel is required.

Q: Does it come with a transmission? No, but it does include the ECU and wiring harness needed to run the EFI system.

Q: Why does it need a custom exhaust? The RS-X cylinder head port design does not match off-the-shelf header patterns, so Chevrolet Performance calls for a custom system.

Specifications