2009 Amsoil/Mopar Muscle Engine Challenge LaRoy Engines & ProMax Performance

To optimize their combination, ProMax ported their Edelbrock Performer RPM heads in-house, keeping the runner volume reasonable, to match their flat-tappet camshaft. By not porting for maximum flow, ProMax sacrificed a little peak power, but made up for it with smooth and broad torque and horsepower curves. To save costs, the Edelbrock 2.14-inch intake and 1.81-inch exhaust valves were retained, along with the Edelbrock valvesprings. This choice, along with factory-style adjustable rocker gear, kept the cost of this engine reasonable, which was important to finish well this year. To feed this 451-inch big-block, ProMax chose an Edelbrock PN 2886 Victor intake manifold and a ProMax custom blueprinted 850 carb. At 568.9 horsepower and 518.1 lb/ft of torque, this engine is a stout performer, placing fourth in the 2009 Amsoil/Mopar Muscle Engine Challenge.

What's Up for 2010
The rules for the 2010 contest are posted on the website, so be sure to check them. In 2010, our dyno contest will feature the small-block Mopar with RHS cylinder heads, and it will be a horsepower per cubic inch shootout. We love diversity in our contest and accept applications from engine builders throughout the country. We don't care if you're running a huge production shop or if you're building Mopar engines in your garage.