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Big Block Power Combo - Real Fine 509, Part 2

We Put Our Big-Bore Rat On The Dyno To See How Close It Comes To The Bull's Eye Of Dart's Projected Performance.

By Barry Kluczyk, Photography by Barry Kluczyk

As we mentioned, Dart's prediction for our project engine was 668 hp and-drum roll, please-that's exactly what we got: a peak of 668 hp at 6,000 rpm (668.9 horses, to be more precise). And while the dead-on prognostication was impressive, even more so was the overall performance of our big-bore 509. With its strong low-end torque and deep-breathing heads, the engine quickly started making big power. It crossed the 400hp level by 3,600 rpm and hit 500 by only 4,400 rpm. By 5,100 rpm it was making 600 hp and it kept pulling to nearly 6,500 rpm-that's some serious revs for a big-block street/strip engine and one of the primary reasons we were interested in exploring the big-bore/short-stroke combination.

Maskin, who's had decades of experience building racing engines, was philosophical about the results. Or, to put it another way, he wasn't surprised.

"We've been doing this a long time," he says. "We know what other engines of larger and smaller displacements make with the same basic components, so estimating the horsepower pretty much comes down to the displacement of the combination."

His confidence was reassuring and we were enthused to find our project engine exceeded expectations on all fronts. We already have an idea of what we're going to do with the engine, but that's another story for a future issue.

ON THE DYNO
RPM HORSEPOWER* TORQUE (LB-FT)*
2600 260.3 523.8
2700 276.7 538.1
2800 299.8 562.3
2900 320.7 580.8
3000 337.8 591.6
3100 347.0 587.7
3200 355.1 582.7
3300 366.1 582.7
3400 377.2 582.7
3500 389.6 584.6
3600 404.7 590.3
3700 419.1 594.9
3800 438.7 600.3
3900 440.4 601.3
4000 459.4 606.7
4100 479.4 611.8
4200 485.5 613.1
4300 498.2 615.7
4400 519.6 620.3
4500 533.8 623.0
4600 541.5 618.6
4700 553.5 618.6
4800 564.0 617.1
4900 578.5 620.1
5000 592.5 622.4
5100 603.2 621.3
5200 611.6 617.7
5300 620.3 614.6
5400 634.4 617.0
5500 643.6 614.6
5600 653.3 612.7
5700 652.4 601.1
5800 654.1 592.4
5900 653.1 581.3
6000 668.9 585.5
6100 658.2 566.8
6200 636.3 539.1
6300 620.3 517.1
6400 625.3 516.7
SOURCES
Dart Machinery
353 Oliver St.
Troy
MI  48084
248-362-1188
www.dartheads.com
By Barry Kluczyk
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