Engine Break-In Procedure
Use conventional or break-in oil (non-synthetic) for the first oil change, be sure to check the oil level in the engine and prime the oil system with an engine priming tool.
Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. This is critical to break in the camshaft.
Drive the vehicle with varying speeds and loads on the engine for the first 30 miles. Be sure not to use a lot of throttle or high RPM. Run five or six medium-throttle accelerations to about 3000 RPM (40 to 50 MPH), then letting off in gear and coasting back down to 20 MPH. Run a couple of hard throttle accelerations up to about 5000 RPM (55 to 60 MPH), then letting off in gear and coasting back down to 20 MPH.
Let the engine cool and change the oil and filter using conventional (non-synthetic) oil and check coolant level, top off if necessary. Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading. Change the oil and oil filter again using conventional (non-synthetic) oil. Keep an eye on oil level during the first thousand or so miles.
It would be suitable to use synthetic motor oil after the second recommended oil change and mileage accumulation.
The Classic L88 427 Big-Block
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. It powered some of the most storied cars in high-performance history.
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. They 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. The engine's top half is the same as the Limited Edition Anniversary 427; the intake is a matching high-flow oval port aluminum piece. With 490 ft/lbs torque and a conservative 480 HP rating, this is still one of the best crate engines for nearly any big block application!
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 TECH SPECS:
- Engine Type: Chevy Big-Block V-8
- Displacement: 427ci
- Bore x Stroke: 4.250'' x 3.750''
- Block: Cast-iron with four-bolt main caps
- Crankshaft: Forged steel
- Connecting Rods: Forged steel
- Pistons: Forged aluminum
- Camshaft Type: Hydraulic roller
- Camshaft Lift: .527'' intake / .544'' exhaust
- Camshaft Duration (@.050 in.): 224° intake / 234° exhaust
- Cylinder Heads: Aluminum oval port, 110cc combustion chambers
- Valve Size: 2.190'' intake / 1.880'' exhaust
- Compression Ratio: 10.1:1
- Rocker Arms: Aluminum roller style
- Rocker Arm Ratio: 1.7:1
- Distributor: HEI type
- Carburetor: 770-cfm
- Water Pump: Aluminum, short-style
- Spark Plugs and Wires: Included
- Flexplate: 14'' diameter, internally balanced
- Recommended Fuel: Premium pump (92 octane)
- Ignition Timing: Base 36° Total @ 4000 rpm
- Maximum Recommended RPM: 6400
- Balanced: Internal
Will this engine fit in a 1966 Chevy impala base model?
will this zz427 have oil pan clearance and hood clearance in an 1966 corvette org. BB car?
Does the oil pan that comes on the engine fit a 69 chevelle
Trying to maintain a somewhat stock appearance on a customers car ...will stock valve covers fit ..from a 69 Chevelle ss
How many inches of vacuum will this engine produce at an idle? I want to run power breaks and I think they require 15 inches of vacuum.
so I just bought one, and I have a question, It reads on the gm spec page(part# 19211813) ZZ427/430 ENGINE ASSEMBLY are they referring to the displacement with the (430) or HP? thanks
hello I was wondering since this has oval ports heads, will and old tri power set up bolt up to these heads? building a 68 corvette and love the look of the tri power set up. thanks scott
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