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Chevy Big-Block Engine - Big Time Power
Q&A With George Ullrich From Speed-O-Motive
CHP: Which of Speed-O-Motive's big-blocks packs the most bang for the buck?
George Ullrich: I'd have to say our 506 Budget Stroker Engine. It's a 0.100-over 454, so it has a 4.350-inch bore and a 4.250-stroke. We use a 6.385-inch rod. CHP: What kind of heads and cam do you use?
GU: We use Dart Iron Eagle BBC heads, and most people go for a hydraulic flat-tappet cam. CHP: OK, what kind of power does it make, and what does it cost?
GU: Our 506s usually make 550-575 hp. A full engine costs about $7,250, turnkey and dyno-tuned. CHP: Which engine in your best-seller?
GU: Our 540 would be right up there. The Street Master version runs 10.5:1 compression and makes about 700 hp. We use RHS iron heads, with aluminum heads available as an upgrade. It goes for about $10,600. CHP: You use a Dart block for that engine?
GU: Yes, and all forged internals. It's very heavy-duty. CHP: Could you make the same amount of power based on a 454 block?
GU: We could bump one up to about 650 hp, but by the time you put on aluminum heads and a roller cam to get there, the cost would be up to about 10 grand. CHP: So that engine would cost almost as much as one of your Dart-based 540s?
GU: Yes, but without the advantages of the Dart block. The cooling is better, and the priority main oil system makes for a more stable platform. Q&A With Bill Mitchell Of World Products
CHP: Bill, what's hot at World Products?
Bill Mitchell: I'd say the 572 Hardcore version big-block. Hardcore signifies a 4500-series carb, single-plane manifold, and it runs a solid-roller cam. It's very popular, but at $12,495 it's not cheap. CHP: What kind of power are we talkin' here?
BM: The iron-head version makes 675 hp; with aluminum heads it makes 20 more. CHP: Are there any other engines that are doing well?
BM: The 540 Hardcore big-block is among our top 10 most popular products. It comes with cast-iron or aluminum heads and makes 610 or 630 hp. It goes for about $11,000. CHP: We understand you've just done some cam testing on that motor?
BM: Yes. With a hydraulic cam and lifter swap, the 540 jumped up to 690 hp, along with 618 lb-ft of torque. That's 60 extra horsepower for $600. We anticipate that the hydraulic-roller cam will be a big sell- ing point. CHP: World Products is well known for its aftermarket blocks. What are the advantages of going to a Merlin block?
BM: The key to making power is displacement. When you've got the architecture to build a big motor, it makes sense to use it. | Dyno Details 454 | | Heads | GM Rectangular/Oval cylinder head | | Compression | 8.8:1 | | Cam | hydraulic roller, 230/236 degrees duration, lift unknown | | Induction | 850-cfm Mighty Demon carb, Performer RPM intake | | Exhaust | Hooker Super Comp headers, two-chamber Flowmaster mufflers | | Timing | locked out @ 38 degrees | | Max torque | 541 lb-ft @ 4,100 rpm | | Max power | 501 hp @ 5,500 rpm | | Avg torque | 483.9 lb-ft | | Avg power | 405.4 hp | | RPM | Lb-ft | Hp | | 3,100 | 526 | 310 | | 3,200 | 523 | 319 | | 3,300 | 524 | 329 | | 3,400 | 526 | 341 | | 3,500 | 528 | 352 | | 3,600 | 530 | 363 | | 3,700 | 533 | 375 | | 3,800 | 536 | 387 | | 3,900 | 538 | 400 | | 4,000 | 540 | 411 | | 4,100 | 541 | 422 | | 4,200 | 540 | 432 | | 4,300 | 536 | 439 | | 4,400 | 533 | 446 | | 4,500 | 528 | 452 | | 4,600 | 523 | 458 | | 4,700 | 518 | 464 | | 4,800 | 514 | 470 | | 4,900 | 510 | 475 | | 5,000 | 506 | 482 | | 5,100 | 501 | 487 | | 5,200 | 496 | 491 | | 5,300 | 492 | 496 | | 5,400 | 486 | 499 | | 5,500 | 478 | 501 | | 5,600 | 468 | 499 | | 5,700 | 460 | 499 | | 5,800 | 451 | 499 | | 5,900 | 444 | 499 | | 6,000 | 434 | 496 |
| Dyno Details 496 | | Heads | AFR 305c | | Compression | 10:1 | | Cam | hydraulic roller, 242 degrees duration, lift unknown | | Induction | Holley 850-cfm marine carb, Performer RPM intake | | Exhaust | Westech shop headers | | Timing | 36 degrees | | Max torque | 621 lb-ft @ 4,600 rpm | | Max power | 613 hp @ 5,700 rpm | | Avg. torque | 591.8 lb-ft | | Avg. power | 516.6 hp | | RPM | Lb-ft | Hp | | 3,100 | 560 | 330 | | 3,200 | 565 | 344 | | 3,300 | 574 | 361 | | 3,400 | 584 | 378 | | 3,500 | 593 | 395 | | 3,600 | 599 | 410 | | 3,700 | 604 | 425 | | 3,800 | 608 | 440 | | 3,900 | 611 | 454 | | 4,000 | 613 | 467 | | 4,100 | 615 | 480 | | 4,200 | 616 | 493 | | 4,300 | 618 | 506 | | 4,400 | 619 | 519 | | 4,500 | 620 | 531 | | 4,600 | 621 | 543 | | 4,700 | 620 | 555 | | 4,800 | 618 | 565 | | 4,900 | 615 | 574 | | 5,000 | 610 | 581 | | 5,100 | 606 | 588 | | 5,200 | 601 | 595 | | 5,300 | 596 | 601 | | 5,400 | 590 | 607 | | 5,500 | 582 | 610 | | 5,600 | 574 | 612 | | 5,700 | 565 | 613 | | 5,800 | 555 | 613 | | 5,900 | 544 | 611 | | 6,000 | 532 | 608 | | 6,100 | 521 | 605 | | Dyno Details 540 | | Heads | Dart Pro 1 | | Compression | 9:1 | | Cam | hydraulic roller, 0.566 inch lift, 224 degrees duration at 0.050 | | Induction | 850-cfm Speed Demon, Edelbrock Victor intake, open 1-inch spacer | | Exhaust | Hooker headers | | Timing | 35 degrees | | Max torque | 641 lb-ft @ 4,200 rpm | | Max power | 581 hp @ 5,300 rpm | | Avg. torque | 618.7 lb-ft | | Avg. power | 498.7 hp | | RPM | Lb-ft | Hp | | 3,100 | 612 | 361 | | 3,200 | 612 | 373 | | 3,300 | 616 | 387 | | 3,400 | 622 | 403 | | 3,500 | 627 | 418 | | 3,600 | 631 | 433 | | 3,700 | 634 | 447 | | 3,800 | 636 | 461 | | 3,900 | 637 | 473 | | 4,000 | 637 | 486 | | 4,,100 | 638 | 498 | | 4,200 | 640 | 512 | | 4,300 | 641 | 525 | | 4,400 | 642 | 538 | | 4,500 | 641 | 549 | | 4,600 | 637 | 558 | | 4,700 | 631 | 564 | | 4,800 | 623 | 570 | | 4,900 | 616 | 574 | | 5,,000 | 607 | 578 | | 5,100 | 599 | 581 | | 5,200 | 588 | 582 | | 5,300 | 577 | 582 | | 5,400 | 563 | 579 | | 5,500 | 551 | 577 |
Chevrolet Corvette Research
Review in-depth reviews on the new Chevrolet Corvette, featuring test drives, comparisons, options, features and more. The 2010 Corvette is equipped with a V8 engine, generating 505 horsepower, and it has drivers side crash test ratings of 8 stars and passengers side crash test ratings of 8 stars.
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