Details

ZZ572/720R Deluxe Crate Engine
685 lb.-ft. @ 4,500 rpm 720 hp @ 6,250 rpm

Our baddest, most powerful big-block engine is ready for the strip!

A 10-second car is quick, but the ZZ572/720R could achieve that with a couple of its spark plugs left in the pits. It is the king of all Rat engines and is capable of pulling your bracket racer or heads-up challenger down the 1320 in the 9-second range.

The ZZ572/720R’s true value lies in its ready-to-run status when delivered. Rather than waiting weeks for a racing engine shop to build a custom combination, we deliver the ZZ572/720R fully assembled; just bolt on the included Dominator-style 1150-cfm carburetor, along with a starter and fuel pump (not included) and you’re ready to go.

The ZZ572/720R is built with the best stuff we can find, inluding an all-forged rotating assembly, rectangular-port aluminum cylinder heads with 113cc intake ports and 2.25/1.88-inch valves. There’s also a solid roller camshaft with 0.714/0.714-inch lift.

If you’re building the ultimate dual-purpose car, the ZZ572/720R is suitable for limited forays on the street. It has a 12.0:1 compressionratio, so make sure you’ve got access to 110-octane gasoline before hitting the local cruise night!

ZZ572/720R Deluxe Crate Engine Installation Notes

Due to crate fitment, the carburetor is shipped in a separate box and needs to be installed by an engine installed

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, ignition coil, and fuel pump (not included)

Gen VI tall-deck block has machined mechanical fuel pump boss

Comes with a 14" automatic transmission flexplate. Requires internally balanced flywheel for manual transmission applications

Designed for pre-1976 street vehicles or any off-road vehicles

Not intended for marine applications

Big sticky slicks will help hook up this monster

Specification

Tech Specs

ZZ572/720R Deluxe Crate Engine Tech Specs Engine type: Chevy Tall Deck Big-Block V-8 Displacement (cu in): 572 Bore x stroke (in): 4.560 x 4.375 Block (p/n 19212195): Cast-iron with 4-bolt main caps Crankshaft (p/n 88961554): Forged steel Connecting rods (p/n 88962926): Forged steel, shot peened Pistons (p/n 88963227): Forged aluminum Camshaft type (p/n 88962216): Mechanical roller Camshaft lift (in): .714 intake / .714 exhaust Camshaft Duration (@.050 in): 278° intake / 282° exhaust Cylinder Heads (p/n 88961160): Aluminum rectangular port, 118cc chambers Valve size (in): 2.250 intake / 1.880 exhaust Stainless steel Compression ratio: 12:1 Rocker arms (p/n 12361323): Aluminum roller style Rocker arm ratio: 1.7:1 Distributor (p/n 10093387): Electronic ignition Carburetor (p/n 19170096): 1150-cfm Dominator Water pump (p/n 19168602): Aluminum, short-style Spark plugs and wires: Included Recommended fuel: 110 octane race gas Ignition timing: Base 8° BTDC, 36° Total Maximum recommended rpm: 6,750 Balanced: Interna

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