Edelbrock Your North American Edelbrock parts from Marken Performance 1-888-401-1362 Shop Upper Engine Kits
Edelbrock's dyno video of a 555ci, single 4-barrel big-block Chevy pulled 903 horsepower and 722 torque with just 9.2:1 compression ratio. With the exception of a solid roller camshaft and a little intake manifold porting, the engine was off-the-shelf ready-to-go. The Edelbrock Musi heads, Edelbrock intake manifold and Holley Dominator carburetor are available from Marken Performance.
The short block is comprised of a Merlin block bored to 4.560-inch and fitted with a Callies 4.250-inch-stroke crankshaft, Oliver rods and Diamond pistons. A Moroso billet pump with 7-quart pan provide lubrication. Key to the performance potential is the Edelbrock top-end combo of 24-degree Musi/Victor CNC-ported cylinder heads (PN 61419 bare, PN 61409 assembled) and a Super Victor intake manifold (PN 2917). The cylinder heads were bolted on right out of the box while the intake manifold was flow tested and then port-matched to the intake gasket. Edelbrock also offers a tall-deck model. A Holley Dominator 1050 cfm carburetor was used.
The cylinder heads were developed along with noted engine builder and racer Pat Musi, starting with Edelbrock’s 24-degree A356 aluminum casting that is heat treated to T6 specs. The exhaust ports are raised .750-inch, and extra material is added to the deck and spring pockets for improved durability. The ports are the CNC machined to Musi’s specs, resulting in 119cc combustion chamber and 367/377cc intake runners. Although the head is available bare, Vbrancic used a set that came assembled with 2.300/1.900 stainless-steel valves, Manley springs and titanium retainers. Vrbancic added the Jesel 1.75/1.70 rockers.
The same Musi 24° CNC Heads # 61419 were mated with the Edelbrock Super Victor CNC Manifold # 29270 and a F2 pro charger producing 1557 Horsepower and 1158 ft-lbs of Torque on a Chevy big block 548 cu in.
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