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.
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):
Connecting Rods (P/N 19211226):
Pistons (P/N 19171618):
Camshaft Type (P/N 12366543):
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
Rocker Arms (P/N 19210726):
Aluminum roller style
Rocker Arm Ratio:
Distributor (P/N 19212081):
Carburetor (P/N 19170093):
Water Pump (P/N 19168602):
Spark Plugs and Wires:
Flexplate (P/N 12561217):
36° @4,000 rpm
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.
Connect & Cruise systems provide factory-engineered engine-and-transmission combinations that include the electronic control module, all wiring harnesses, and other key components you need.
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.
* The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.
***The Manufacturer's Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Includes destination freight charge and gas guzzler tax.
Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.
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.