< Previous
  • ZZ 427 Big Block Crate Engine
Next >



Part No.


Find a Store
Near You

For Off-Road &

For Off-Road &

6 Select
Available Mods


hp @ 5800 rpm

The Classic L88 427 updated for the 21st century

Between 1967 and 1969, the legendary L88 was the ultimate expression of Chevy’s Big-Block power, combining a rigid iron cylinder block with lightweight aluminum cylinder heads and a single four-barrel carburetor. That raspy rat engine was rated at 480 horsepower, although the figure was generally thought to be on the conservative side.

Chevrolet Performance has recreated that classic Big-Block combination in the Z427/480 — including the 480 horsepower rating (and it just might be a little on the conservative side, too). Like the original, it features a forged steel crankshaft and high-flow, oval-port aluminum cylinder heads. We’ve upgraded the camshaft from the original’s mechanical flat-tappet design to a smoother hydraulic roller, which delivers great drivability characteristics and a broader rev range. A 10.1:1 compression ratio means it will perform great on pump gas, too.

Whether you’re building a ’69 COPO Camaro resto-mod tribute, a modified mid-year Corvette, or a street-tire class winner, the ZZ427/480 is the heritage-inspired crate engine that delivers the performance that built the Big-Block’s legendary reputation.

ZZ427/480 DYNO

Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.


Part Number:
Engine Type:
Chevy Big-Block V-8
Displacement (cu. in.):
Bore x Stroke (in.):
4.250 x 3.750
Block (P/N 19170538):
Cast-iron with four-bolt main caps
Crankshaft (P/N 19171620):
Forged steel
Connecting Rods (P/N 19211226):
Forged steel
Pistons (P/N 19171618):
Forged aluminum
Camshaft Type (P/N 12366543):
Hydraulic roller
Camshaft Lift (in.):
.527 intake / .544 exhaust
Camshaft Duration (@.050 in.):
224° intake / 234° exhaust
Cylinder Heads (P/N 19211799):
Aluminum oval port, 110-cc chambers
Valve Size (in.):
2.190 intake / 1.880 exhaust
Compression Ratio:
Rocker Arms (P/N 19210726):
Aluminum roller style
Rocker Arm Ratio:
Distributor (P/N 19212081):
HEI type
Carburetor (P/N 19170093):
Water Pump (P/N 19168602):
Aluminum short-style
Spark Plugs and Wires:
Flexplate (P/N 12561217):
Recommended Fuel:
92 octane
Ignition Timing:
Base 10° BTDC, 36° Total
Maximum Recommended rpm:

NOTE: Distributor with melonized steel gear MUST be used with long-blocks and partial engines with steel camshafts, or engine damage will occur.


Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

< Previous
  • ZZ 427 Big Block Crate Engine Installation


    • Due to crate fitment, the carburetor is shipped in a separate box and needs to be installed by an engine installer
    • Requires addition of starter and fuel pump (not included)
    • Clutch linkage bosses are drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads for clearance
    • Comes with an internally balanced 14" automatic transmission flexplate. Requires flywheel designed for internally balanced engines
    • Designed for pre-1976 street vehicles or any off-road vehicle
    • Not intended for marine applications
Next >


Download a catalog for a full listing of components and related parts.

SuperMatic 4L85-E Four-Speed
Transmission • P/N 19154550

Transmission Controller • P/N 19212657

Serpentine Accessory Drive Belt System With Air Conditioning • P/N 19172805

High-Torque Mini-Starter • P/N 12361146

Fuel Pump Block-Off Plate • P/N 12341999

Fuel Pump, Street Performance (Chevy Big-Block)
• P/N 12355614

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.

Destination Freight Charges

To allow you to do an accurate price comparison with prices featured on other Internet sites, GM provides Internet pricing both with and without the Destination Freight Charge (see prices including Destination Freight Charge below). To get full pricing details, go to our Build Your Own section.