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What The Haymaker is Made of
Hull: Tom Papp "Stealth"
racing hull
Motor: ZZ572 720R Chevrolet Crate
Motor Specifications:
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Engine Type:
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Chevy big-block V-8 |
| Displacement (cu in): |
572 |
| Bore x stroke (in): |
4.560 x 4.375 |
| Block: |
Cast iron with 4-bolt
main caps |
| Crankshaft: |
Forged steel |
|
Connecting rods:
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Forged steel, shot peened |
| Pistons: |
Forged aluminum |
| Camshaft type: |
Mechanical roller |
| Camshaft lift (in): |
.714 intake/ .714 exhaust |
| Camshaft duration (@.050
in): |
266 intake / 274 exhaust |
| Cylinderheads: |
Aluminum rectangular port
118cc chambers |
| Valve size (in): |
2.25 intake /1.88 exhaust |
| Compression ratio: |
12:1 |
| Rocker arms: |
Aluminum roller style |
| Rocker arm ratio: |
1.7:1 |
| Distributor: |
HEI |
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Carburetor:
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1090 cfm
|
| Water pump: |
Aluminum, short-style |
| Spark plugs & wires: |
Included |
| Recommended fuel: |
110 octane race gas (currently
running alchohol) |
| Ignition timing: |
36 degree total @ 5000
rpm |
| Maximum rpm: |
6750 |
The ultimate
beast!
When our GM Performance
Parts engineers sat down and designed the ZZ572/720R, we told
them to build something nasty. We think they accomplished
that mission with a resounding 720 horsepower and 685 lb.-ft.
of torque –creating at the same time the most powerful
big-block crate engine ever offered by GM Performance Parts.
We took the ultra-popular
ZZ572/620 pump gas street engine added 12:1 compression pistons,
a hotter camshaft, and our rectangular-port aluminum Bowtie
heads with stiffer valve springs to work with the new cam.
The block is the Gen VI tall-deck Bowtie block which was designed
for the 572" application. The solid roller camshaft is
a .714" lift magic maker that aggressively feeds the
air/fuel mixture into the hungry, high-squeeze, stroker big-block.
The ZZ572/720R
is rated at 720 horsepower at 6250 rpm and 685 lb.-ft. of
gut-wrenching torque at 4500 rpm. The short block is built
with a 4340 forged steel crankshaft, shot-peened forged steel
rods, forged aluminum pistons with full-floating wrist pins,
stiff dual valve springs, and a louvered oiling windage tray.
Our Deluxe ZZ572/720R ships with a 1090-cfm Demon four-barrel
carburetor, tall-deck single-plane intake manifold, HEI distributor,
aluminum short-style water pump, and 8 mm spark plug wires.
Distinctive "572" cast aluminum valve covers complete
the package. All you need is a GM Performance Parts lightweight
starter to fire it up!
*Applications have
not been validated. They are merely suggestions of how you
might enjoy your GM Performance Parts crate engine. Some applications
may affect engine warranty. Some applications may not be emission
legal; check state and local ordinances.
Manufacturer: GM Performance Parts
Horsepower : 720 @ 6250 RPM
Torque : 685 @ 4500 RPM
Max RPM : 6750 RPM
Compression : 12.0:1
Block : Sportsman Tall Deck Bow Tie
Bore Diameter : 4.560"
Stroke (inches) : 4.375"
Crankshaft : Forged 4340 Steel
Camshaft : Solid Roller, 0.714"/0.714" Lift
Intake Manifold : Not Included
Jet Pump: Aggressor
Jets
Fuel Type: Blown Alcohol
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