We haven't factored the final costs of these engines yet, but we thought you'd like to know how much power the small-blocks made in the Amsoil/Mopar Muscle Engine Challenge.
Comp Cams graciously hosted...
Comp Cams graciously hosted this year's Engine Challenge, providing their facility, staff, and great lunches!
Rockett Brand's Tim Wusz was...
Rockett Brand's Tim Wusz was on hand to provide technical data and help pump their 93 octane pump gas.
While the final results of the '07 Engine Challenge haven't quite been factored yet, we thought you'd be impressed by the power these small-blocks made. This year's challenge saw engine displacements from just over 318 ci to the contest limit of 410 ci. The diversity the builders used to create these engines impressed us as well. Both cast-iron and aluminum heads were utilized, as were flat-tappet and roller camshafts. Single four-barrel induction was the standard, but dual-quads on a tunnel-ram intake adorned one engine, and another had Six-Pack induction.
Comp Cams again provided their Memphis dyno facility for the event, and Rockett Brand sponsored our challenge with their 93 octane pump fuel. So when looking at the power these engines made, remember they did it not on race gas, but on fuel very similar to what you can get at your local station.
Mid America Racing Engines, Washington, Iowa
Utilizing Indy heads and a roller cam, the Mid America Racing Engines entry topped the contest in terms of raw power, making 567.1 hp and 489.2 lb-ft of torque for a leading score of 1056.3
Speed-O-Motive, West Covina, California
The Speed-O-Motive entry utilized Brodix AMC cylinder heads atop their Mopar small-block to make 529.2 hp and 467.2 lb-ft of torque, placing second in terms of raw power.
Indy Cylinder Head, Indianapolis, Indiana
The guys from Indy Cylinder Head impressed everyone when their Magnum-headed, flat-tappet 408 screamed to 523.7 hp and 455.0 lb-ft of torque, third in terms of overall power and topping all the other cast-iron headed engines in the contest.
R.M. Competition, Roseville, Michigan
Sporting a tunnel-ram and dual-quad induction, Randy Malik's Magnum-headed entry made 510.3 hp and 442.1 lb-ft of torque, landing him fourth at the end of the dyno pulls. When cost is factored, this engine should be competitive.
Also worthy of note is the correction factor that was used during the dyno sessions. Comp's dyno was set to record the SAE corrected power and torque of these engines instead of the more common Standard corrected power. Since the Standard correction factor nets a higher power number, most engines are rated on their standard corrected horsepower. Had Comp's dyno been recording numbers using standard correction factors, the numbers would have been some 5 percent higher than shown here. Regardless of the correction factor used, these are some stout small-blocks, and we'd love to have any one of them in one of our street cars.
When the dyno results were finally tallied, last year's winner--Mid America Racing Engines--made the most power this year. Read along as we tally each engine builder's dyno results and be sure to stay tuned for the final results of the Amsoil/Mopar Muscle engine challenge.
Schurbon Engine and Machine, Maquoketa, Iowa
Fifth in overall power was the Schurbon Engine and Machine entry at 490.4 hp and 459.4 lb-ft of torque for a combined score of 949.8. This was a very strong engine with broad torque and power curves and is certain to be in the hunt once we factor costs.
Muscle Motors, Lansing, Michigan
Sporting a trio of Demon two-barrels, the Muscle Motors entry made 455.9 hp and 456.1 lb-ft. of torque for a combined score of 912.0, sixth in terms of combined power and torque.
MRL Performance, Jackson, Michigan
Though the smallest engine in our competition at just over 318 ci, the MRL entry still managed 380.5 hp and 330.6 lb-ft of torque for a seventh place finish in terms of power.
Diamondback Racing Engines, Richmond, Texas
Although a rocker arm problem during their first pull prevented them from qualifying, the Diamondback entry still made very respectable power before the first pull was aborted. Had the crew had time for repairs, this would have been a very stout small-block.