[Mansour Alturki]

Anyone can advise on providers of parts for the zz572/620 Chevy performance engine?

Chevy doesn’t seem to be responding.

 

[Harris Roc Malouda]

What exactly are you looking for?
This is just the part list from their homepage:

TECH SPECS
Part Number: 19331583
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 88962925): Forged aluminum
Camshaft Type (P/N 19210721): Hydraulic roller
Camshaft Lift (in): .632 intake / .632 exhaust
Camshaft Duration (@.050 in): 254° intake / 264° exhaust
Cylinder Heads (P/N 19331429): Aluminum rectangular port, 118cc chambers
Valve Size (in): 2.250 intake / 1.88 exhaust; stainless steel
Compression Ratio: 9.6:1
Rocker Arms (P/N 19210726): Aluminum roller style
Rocker Arm Ratio: 1.7:1
Distributor (P/N 88961867): HEI
Carburetor (P/N 19170095): 850-cfm
Water Pump (P/N 19168602): Aluminum, short-style
Spark Plugs and Wires: Included
Flexplate (P/N 12561217): 14"
Recommended Fuel: Premium pump
Ignition Timing: 36° Total at 4,000 rpm
Maximum Recommended rpm: 6,000
Balanced: Internal
Intake Manifold (P/N 88961161): Single Plane

 

[Busted Knuckles]

If these part numbers are correct (and I have no reason to believe they aren't), the heads are waaaaay too small for that many cubes. Casting number visible on the link ends in -3401 that, according to many here, aren't worth the time it takes to rework 'em. They're the same casting as used in the NHRA legal superstock head. Better than the original L88 head but in terms of power, not by much.

 

[shovelrick]

Mike Lewis Racing Engines, TC member aka Wolfplace, more bang for your buck than GM IMO

 

[Tom Mobley]

Mike is retired, not accepting engine builds.