Overview

Chevrolet Performance ZZ427/480 HP Long Block Crate Engines

Chevrolet Performance has recreated the classic L88 Big Block combination in the ZZ427/480 long block crate engine. Rated at 480 hp, it features an iron block, forged steel crankshaft, and high-flow aluminum cylinder heads. An upgraded hydraulic roller camshaft improves drivability and rpm range, while lower 10.1:1 compression means you can enjoy the power on pump gas, too.

The ZZ427 comes complete with: high-flow oval port heads, a high-lift camshaft, aluminum intake manifold, 770 cfm Holley carburetor, an HEI distributor, aluminum water pump, balancer, spark plug wires, and a 14 in. flexplate. If you’re looking for a modern version of the classic L88, the Chevrolet Performance ZZ427/480 long block crate engine is the answer.

Additional specs and features include:

* 4.250 in. bore with 3.750 in stroke
* Cast iron block with 4-bolt main caps
* Forged steel crankshaft
* Forged steel connecting rods
* Forged aluminum pistons
* Hydraulic roller camshaft:
– Valve lift .527 in. intake/.544 in. exhaust
– Duration (.050 in) 224 intake/ 234 exhaust
* Aluminum oval port heads with 110cc chambers
* 2.190 in. intake/1.880 in. exhaust valves
* 10.1:1 compression ratio
* Aluminum 1.7:1 ratio roller rocker arms
* HEI distributor
* 770 cfm carburetor
* Aluminum short water pump
* Ignition timing base 10 degrees BTDC, 36 degrees total
* 6,400 maximum recommended rpm