19331581 Chevrolet Performance ZZ572/620Base
621 HP Same As The Deluxe But W/O Carb, Dist, W/O Manifold.
ZZ572/620 GM?S LARGEST MOST POWERFUL STREET ENGINE The new ZZ572/620 is built around an all-new Gen VI tall deckBow Tie cylinder block. This all new race block is filled with aforged 4340 steel crank with 4.375 inch stroke, shot peenedforged 4340 H-beam rods, and forged aluminum pistons withfull floating wrist pins. Hard core race parts for hard core longterm durability! Equipped oil pan may not clear Chevelle and Camaro applications.
The redesigned rectangular port aluminum cylinder headsresult in a pump gas friendly 9.6 to 1 compression ratio. Ahydraulic roller cam with 0.632 inch lift actuates the stainlesssteel valves. And, of course, hardened chromemoly retainers,roller rocker arms, and dual valve springs are used tocomplete the valvetrain.
A new GM tall deck single plane intake manifold and 850 CFMDemon carburetor deliver enough air and fuel to make the620 horsepower at 5500 RPM and 650 ft.lbs. of torque at4500 RPM. Ignition is handled by a GM HEI distributor.
Pump gas friendly, massive torque and horsepower, all fromGM, the ZZ572/620 is for those who consider excess to bebarely enough.
Available in both long block and deluxe engine configurations.
ZZ 572/620R Technical InformationHorsepower ..................... 620@ 5500 RPM
Torque .......................... 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM ..... 6000 RPM
Compression Ratio ............. 9.6:1
Block ............................ New! Sportsman Tall DeckBowtie Gen VI10.200" deck height
Bore ............................. 4.560"
Stroke ........................... 4.375"
Crankshaft ...................... Forged 4340 steel
Connecting Rods ............... Forged 4340 steelH-beam styleShot peened
Pistons .......................... Forged aluminumFull floating wrist pin
Piston Rings .................... Plasma-moly rings
Camshaft ........................ Hydraulic rollerValve lift: .632" I, 632" EDuration @ .050" 254?I ,264? E
Lifters ........................... Hydraulic roller tappet
Cylinder Heads ................. Aluminum rectangular port118cc combustion chamber
Intake Valves ................... 2.25" Stainless steel
Exhaust Valves .................. 1.88" Stainless steel
Valve Springs ................... Dual valve springs1.540" coil diameter1.800" installed height197 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 ................. New! Aluminum tall deck single plane4150series carburetor
Carburetor ...................... 850cfm, mechanical secondary
Rear Main Seal ................. New! One piece design
Windage Tray ................... New! Screened and louvered
Damper ......................... High RPM torsional damper
Distributor ....................... H.E.I
Ignition Timing .................. 36? total advance
Spark Plugs ..................... R42XLS
Fuel ............................. 92 Octane
Technical Note: Paint Code: 49-24550
Terms and Conditions
Warranty Information
GM Performance Crate Engine Start-up Instructions