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| 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 torque | 710 lb-ft @ 4,500 rpm | | Max power | 700 hp @ 5,600 rpm | | Avg. torque | 668.8 lb-ft | | Avg. power | 579.0 hp | | RPM | Lb-ft | Hp | | 3,000 | 627 | 358 | | 3,100 | 632 | 373 | | 3,200 | 642 | 391 | | 3,300 | 650 | 408 | | 3,400 | 654 | 423 | | 3,500 | 657 | 438 | | 3,600 | 661 | 453 | | 3,700 | 671 | 473 | | 3,800 | 677 | 489 | | 3,900 | 682 | 507 | | 4,000 | 685 | 522 | | 4,100 | 696 | 542 | | 4,200 | 701 | 560 | | 4,300 | 706 | 578 | | 4,400 | 708 | 593 | | 4,500 | 710 | 608 | | 4,600 | 709 | 621 | | 4,700 | 707 | 633 | | 4,800 | 703 | 643 | | 4,,900 | 699 | 652 | | 5,,000 | 693 | 660 | | 5,100 | 688 | 668 | | 5,200 | 682 | 675 | | 5,300 | 677 | 683 | | 5,400 | 670 | 689 | | 5,500 | 664 | 696 | | 5,600 | 656 | 700 | | 5,700 | 643 | 698 | | 5,800 | 634 | 700 | | 5,900 | 622 | 698 | | 6,000 | 609 | 695 | | 6,100 | 591 | 686 | 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.
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