Chevrolet Performance 19331585& ZZ572/720R Deluxe Engine Features:

• 4-bolt main tall deck block
• 1-piece rear main seal
• Rectangular port cylinder heads
  • 118 cc combustion chambers
  • Stainless steel valves
    • 2.250 in. intake valves
    • 1.880 in. exhaust valves
  • Hardened chromoly retainers
  • 1.500 in. dual valve springs
• 1.70:1 ratio aluminum roller rocker arms
• One-piece pushrods
• Mechanical roller camshaft
  • 0.714 in. intake valve lift
  • 0.714 in. exhaust valve lift
  • Duration @ 0.050 in.
    • Intake: 266-degrees
    • Exhaust: 274-degrees
• 1,150 CFM Dominator carburetor
• Tall deck single-plane intake manifold
• Bore: 4.560 in.
• Stroke: 4.375 in.

INSTALLATION NOTES:

• Due to crate fitment, the carburetor is shipped in a separate box and needs to be installed by an engine installer
• Clutch linkage boss is now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads for clearance
• Requires addition of starter and fuel pump (not included)
• Gen VI tall-deck block has machined mechanical fuel pump boss
• Requires an internally balanced flexplate or flywheel (not included)
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
• You do have a strong transmission and rear axle, don't you?
• Distributor with melanized steel gear MUST be used with steel camshafts, or engine damage will occur.
• Chevrolet Performance ZZ572/720R Racing Crate Engines are excluded from a limited warranty.

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 RPMs, with no load on the engine for the first 30 minutes. This is critical to breaking 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 the 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. 

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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