Dale Amy
June 24, 2011

Photo Gallery

View Photo Gallery

On The Dyno

With efficiency that stems from years of experience, Tony McAfee and Jeff Lake had our street-friendly 427 test mule strapped down and hooked up in the dyno cell in short order, plumbing it with a set of Kooks long-tubes with primaries large enough to take advantage of the heads' cavernous exhaust ports. To be honest, little time was spent "perfecting" the combo--it wasn't necessary.

We started with a 650-cfm Demon carb, made two or three pulls while experimenting with ignition timing (the combo seemed to prefer about 31 degrees total timing), then bolted on an 850 Demon for a couple final pulls. As you can see, the result is oodles of torque and better than 1.4 peak horsepower per cubic inch. This is excellent performance from a naturally aspirated bullet with pump gas-friendly 10.5:1 compression and civilized cam specs. Equally important, however, is the longevity that can be expected from the high-quality components and fastidious assembly of the Dart 427 short-block.

w/650 Demonw/850 Demon
RPMHPTQHPTQ
4,700516.3577.0523.8585.4
4,800533.0583.2536.2586.7
4,900547.5586.9547.8587.2
5,000556.4584.4559.7587.9
5,100565.7582.6573.5590.5
5,200570.3576.0582.7588.5
5,300577.0571.9590.1584.9
5,400586.5570.4595.8579.5
5,500594.0567.2599.2572.3
5,600588.1551.5602.3564.9
5,700589.5543.1607.6559.9
5,800602.1545.2609.9552.2
5,900605.7539.2619.0551.1
6,000606.7531.1620.8543.4
6,100603.1519.3625.6538.6
6,200617.1522.8627.7531.7
6,300616.0513.6626.1522.0
6,400614.4504.2622.2510.6
6,500611.2493.9617.4498.9