Dyno Details 572
Chevrolet has a long tradition of underrating the power output of its big-block creations (435 hp for the L88?), and it's nice to know that some things never change, as demonstrated when Westech had occasion to dyno a bone-stock GMPP ZZ572/620 crate engine.
Timing 36 degrees
Max torque710 lb-ft @ 4,500 rpm
Max power700 hp @ 5,600 rpm
Avg. torque668.8 lb-ft
Avg. power579.0 hp
RPM Lb-ftHp
3,000627358
3,100632373
3,200642391
3,300650408
3,400654423
3,500657438
3,600661453
3,700671473
3,800677489
3,900682507
4,000685522
4,100696542
4,200701560
4,300706578
4,400708593
4,500710608
4,600709621
4,700707633
4,800703643
4,,900699652
5,,000693660
5,100688668
5,200682675
5,300677683
5,400670689
5,500664696
5,600656700
5,700643698
5,800634700
5,900622698
6,000609695
6,100591686

Q&A With Jamie Meyer Of GM Performance Parts
CHP: So, does GMPP still actually sell any 454s?
Jamie Meyer: Well, it would obviously be our most affordable big-block. And we sell a lot of our serpentine accessory beltdrive setups for them.

CHP: Then what's the engine people are going for?
JM: We can't keep the 572s in stock. People want the biggest, baddest thing they can get. The Ram Jet 502 also does well because its sort of trick looking. It comes as a surprise when you pop the hood. Our partial engines are also popular, since a lot of people have their own cylinder heads.

CHP: Any partial engine in particular?
JM: The 502 short-block. It's a sleeper. There are generations of guys out there with 454s who are replacing their short-blocks with a 502. It looks like a 454, but then, Surprise!

CHP: What else is popular?
JM: Many people are buying their engines in kit form. They save money, all the parts go together, and they can personalize their engines.

CHP: OK, back to the 572s. There are two versions: the 620hp pump-gas version, and the 12:1-compression, 720hp version. What's the sales breakdown like?
JM: It's just about 50/50, which surprised us. The 572/720 was intended for bracket racers, but we're seeing some extreme street cars, and they'll use that version.

CHP: Is there any other GMPP big-block we should mention?
JM: The ZL-1. It is the most coveted block out there, in my mind. We do sell them, and they're very expensive.

CHP: It seems that it's worth GM's while to keep making big-blocks.
JM: The bottom line is that a big-block is a very American piece of history. They deliver on the promise of a musclecar...they make you feel alive.

SOURCE
Airflow Research
28611 W. Industry Dr.
Valencia
CA  91355
Scott Shafiroff Race Engines
Dart Machinery
353 Oliver St.
Troy
MI  48084
248-362-1188
www.dartheads.com
Smeding Performance
Dept. MMFF
3340 Sunrise Blvd.
Rancho Cordova
CA  95742
Donovan Engineering
2305 Border Ave.
Torrance
CA  90501
3-10/-320-3772
Speed-O-Motive
131 W. Lang Ave.
West Covina
CA  91790
6-26/-869-0270
speedomotive.com
GM Performance Products
Contact your nearest dealer
Summit Racing
P.O. Box 909
Akron
OH  44309-0909
800-230-3030
www.summitracing.com
Larry's Performance SuperFlow Technologies Group
Probe Industries
1650 W. 228th St.
Torrance
CA  90501
310-784-2977
www.probeindustries.com
Westech Performance Group
11098 Venture Dr., Unit C
Mira Loma
CA  91752
9-09/-685-4767
www.westechperformance.com
Scoggin-Dickey Parts Center
Lubbock
TX
N/A
www.sdparts.com
World Products
Ronkonkoma
NY
6-31/-981-1918
www.worldcastings.com