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Chevy Big-Block Engine - Big Time Power

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

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.

Airflow Research
877.892.8844

airflowresearch.com
Scott Shafiroff Race Engines
Dart Machinery Smeding Performance
Donovan Engineering
Torrance
CA  90501-3614
Speed-O-Motive
131 N. Lang
W Covina
CA  91790
GM Performance Products Summit Racing
800.230.3030

summitracing.com
Larry's Performance SuperFlow Technologies Group
Probe Industries
310/784-2977

probeindustries.com
Westech Performance Group
11098 Venture Dr., Unit C
Mira Loma
CA  91752
909-685-4767

www.westechperformance.com
Scoggin-Dickey Parts Center World Products
51 Trade Zone Ct.
Ronkonkoma
NY  11779

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