Guys if you need a new engine for the Miata or the Vega Chevy is coming out with it this year, specs below:
ZZ572/720R
…AND THE R STANDS FOR RACE
Engineered by GM Performance Parts and GM Racing exclusively for sportsman races, the new ZZ572/720R is built around an all-new Gen VI tall deck Bow Tie cylinder block. This all new race block is filled with a forged 4340 steel crank with 4.375 inch stroke, shot peened forged 4340 H- beam rods, and forged aluminum pistons with full floating wrist pins. Plasma moly piston rings are standard is the screened and louvered windage tray. GM’s first purpose built drag race engine filled with hard core race parts for hard core performance and long term durability.
The redesigned rectangular port aluminum cylinder heads result in a race gas only 12 to 1 compression ratio. A solid roller cam with 0.714 inch lift actuates the stainless steel valves. And, of course, hardened chromemoly retainers, roller rocker arms, and duel valve springs are used to complete the valve train.
A new Gm tall deck single plane intake manifold and 1095 CFM King Demon carburetor deliver enough air and fuel to make the 720 horsepower at 6250 RPM. Ignition is handled by a multiple spark discharge ignition. And an SFI approved torsional damper is installed at the factory. Out of the crate and into your racecar – it’s that simple.
Race gas fueled, high revving horsepower, all from GM, the ZZ572/720R is the engine that will get you down the track consistently, pass after pass, season after season.
Available in a short block, long block and deluxe engine configurations in 2003
ZZ572/720R Technical Information
Horsepower………………….720@6250RPM
Torque……………………….685 Ft. Lbs. @4500 RPM
Max. Recommended RPM…..6750 RPM
Compression Ratio…………..12:1
Block…………………………New! Sportsman Tall Deck Bowtie Gen VI
10.200” deck height
Bore……………………………4.560”
Stroke………………………….4.375”
Crankshaft……………………..Forged 4340 Steel
Connecting Rods………………Forged 4340 Steel
H-beam style
Shotpeened
Pistons…………………………Forged Aluminum
Full floating wrist pins
Piston Rings…………………...Plasma-moly rings
Camshaft………………………Mechanical roller
Valve lift .714”I,.714”E
Duration @.050”266/,274E
Lifters………………………Mechanical roller tappet
Cylinder Heads…………….Aluminum rectangular port
118cc combustion chamber
Intake Valves……………….2.25” Stainless steel
Exhaust Valves……………..1.88” Stainless steel
Valve Springs……………….Dual valve springs
1.567” coil diameter
2.050” installed height
230 Lbs. Seat pressure
Spring Retainers…………….Hardened Chromemoly steel
Rocker Arms………………..Aluminum roller rockers 1.7:1 ratio
Push Rods…………………...High Performance one piece
Intake Manifold……………..Aluminum tall deck single plane
4500 series carburetor
Carburetor……………………1095cfm,mechanical secondary
Rear main seal……………….New! One piece design
Windage Tray………………..New! Screened and louvered
Damper………………………High RPM torsional damper
Distributor……………………Multiple spark discharge
Ignition Timing………………36 total advance
Spark Plugs…………………..R42XLS
Fuel…………………………..Race fuel
Dan
