There are few engines that conjure up images of greatness like the 427 Chevy big-block. The ZZ427 big-block crate engine brings back all of the good things that you remember about the 427 with a few modern new upgrades. With an updated cast iron block, a 10.1:1 final compression ratio, and an aggressive hydraulic roller camshaft, the ZZ427 offers you outstanding performance while still living on low octane fuel.
The legendary 427" big-block Chevy powered some of the most storied cars in the history of the high performance automobile. This latest version holds true to that tradition, offering you a tough, 4-bolt main cast iron block with an all forged internal rotating assembly. The top half of the engine is the same as the limited edition Anniversary 427 crate engine aluminum oval-port heads that use 2.19" intake and 1.88" exhaust valves work wtih 1.7:1 aluminum roller rockers and a .527" intake/.544" exhaust camshaft. The intake is a matching high-flow aluminum oval-port piece that gets fed the air/fuel mix from a 770-cfm carburetor. An HEI distributor, aluminum water pump, spark plug wires, and a 14" flexplate round out the package. Internally balanced, the ZZ427 will spin to 6000 rpm before it's time for you to shift.
The ZZ427 is an exciting trip back to one of the high points in the history of the Chevrolet big-block. With a conservative rating of 480 horsepower and loads of torque, it's still one of the best crate engines for just about any big-block application.
Power: 480 HP @ 5800 RPM, 490 ft. lbs. of torque @ 3800 RPM (click on documents tab to view actual Pace dyno sheet)
Displacement: 427 CID
Bore x Stroke: 4.250” x 3.750”
Compression Ratio: 10.1:1
Recommended Fuel: 92 Octane
Block: Cast Iron, 1 piece rear seal, 4-bolt main caps
Crankshaft: Forged Steel
Connecting Rods: Forged Steel
Pistons: Forged Aluminum
Camshaft: Steel Hydraulic Roller Tappet
Cam Lift: .527” Intake / .544” exhaust
Cam Duration @ .050”: 224 deg. Intake / 234 deg. Exhaust
Lobe Separation: N/A
Cylinder Heads: Aluminum Oval Port.
Combustion Chamber: 110cc
Valves: 2.190” Intake/ 1.880” Exhaust
Rocker Arms: Aluminum Roller, 1.7:1 Ratio
Maximum GM Recommended RPM: 6400
Ignition Timing: Base 10 degrees BTDC, 36 degrees total
• Fully GM assembled long block
• Black Cast Aluminum Valve Covers with 427 Logo
• Oil pump, pick-up and oil pan
• Aluminum Performance Intake
• GM Tuned Holley 770CFM, vacuum secondaries, electric choke
• HEI Distributor and Spark Plugs
• 14” Auto Trans Flexplate
• 8” Harmonic Balancer
• Front timing cover
• Cast Aluminum Short Water Pump
• Oil Filter and Adapter
• Passenger Side RH Oil Dipstick and Tube
General Motors limited 2 year / 50,000 mile parts & labor warranty. Click on Document tab above for full details.
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