On this engine, the mountain-like dome of the Hemi slug contributes to a compression ratio
Between the big-flowing heads is an Indy 9.25-inch-tall aluminum intake and an AED-built 1050 Dominator carb. It's a pretty simple combination that relies on the engine's large displacement and a generation's worth of airflow research to make big power. On World Products' engine dyno, our project engine put up some very impressive numbers, with the best being 776.8 horsepower at 7,100 rpm and 641.7 lb.-ft. of torque at 5,800 rpm.
Designed for the high-rpm power needs of the drag strip, our aluminum Hemi project engine crossed the 500-horsepower mark soon after 4,000 rpm, hitting the 600-horse level by 5,100 rpm, and the 700-horsepower threshold by 5,800 rpm. In fact, the horsepower climbed steeply to its 776.8 peak and was still making 771 horses at the test's 7,300-rpm limit.
That's a great power curve and a stellar rev range for a 572-inch Hemi and its mechanically mild valvetrain. And considering it weighs less than 600 pounds in its dyno trim, it's a lightweight powerhouse, too. Even better, it's got a street-able 9.5:1 compression ratio.
Eagle forged steel H-beam connecting rods are connected to the extra-large pistons. They a
World Products' aluminum Hemi definitely has the juice to yank the front tires and pull your Mopar down the 1,320 with the ferocity reminiscent of the good-old days-and with its good idle quality and pump-gas compression ratio, you could drive that track star to and from the strip.
The good-old days were never this good.
|At A Glance|
|Cylinder block||World Products aluminum Hemi|
|Compression ratio||9.5:1 (approx.)|
|Rotating assembly||Forged crankshaft, rods, and pistons|
|Camshaft type||Hydraulic roller|
|Camshaft lift||.381-in. intake; .381-in. exhaust|
|Cylinder heads||Indy 426-1RA|
|Cylinder head airflow||510 cfm (intake) at 28 inches of water|
|Valves||2.400-in. intake; 1.940-in. exhaust|
|Induction||Single-plane manifold w/1050 Dominator|
|Peak horsepower||776.8 at 7,100 rpm|
|Peak torque (lb.-ft.)||641.7 at 5,800 rpm|
|Test weight||527 lbs.|
To make room for longer-stroke combinations, World Products modified the Hemi block's oil
The camshaft is a solid roller that delivers .381/.381-inch lift and 258/266 degrees of du
Despite the oil system revisions in order to accommodate the long-stroke rotating assembly
The lungs on our engine are Indy's 426-1RA Legend heads. Compared to stock Hemi heads, the
The externally-mounted oil pump is a racing-style pump that can flow up to 21 gpm, but wor
A 7-inch-tall Indy, single-plane intake manifold supports the small-for-a-Hemi AED-prepped