Ring-end gap is critical for proper combustion sealing, so be sure to tell Dart's order de
A shot of an installed piston at bottom dead center shows how little of the skirt extends
Should you or your engine builder order Dart's 427 short-block assembly, it will arrive lo
For our buildup and dyno testing, Dart's crew decided to go relatively mild and street-fri
Dart's SHP block is fully machined to accept roller lifters and their associated hardware,
Dart is perhaps best known for its free-flowing cylinder heads, and we went with its top-d
Normally 62cc on the Pro1 or Pro1 CNC heads, Dart machined the heart-shaped chambers on ou
Compared to factory heads, the Pro1 lineup has large raised exhaust ports with a spread bo
New from Dart are these two-piece, adjustable pushrod guideplates, which Tony and Jeff put
...mounting a set of Comp Cams High Energy die-cast 1.6:1 aluminum rocker arms--nothing ex
Likewise there's nothing particularly exotic about the intake that was on hand for our dyn
Dart had a variety of "dyno carbs" on hand, and we decided to start testing with this 650-
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 Demon||w/850 Demon|