To handle oiling, a Milodon...
To handle oiling, a Milodon windage tray was sandwiched between the block and factory Hemi oil pan. A Melling high-volume oil pump kept plenty of Amsoil flowing to critical engine parts.
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.
|Chenoweth Speed and Machine||JD Engine and Machine|
|Mike Chenoweth||Jeff Dickey|
|Morton, IL, 61550||Columbia, MO, 65203|
|LaRoy Engines||Mid America Racing Engines|
|Jim LaRoy||David Bruns|
|Challis, ID 83226||Washington, IA 52353|
|Promax Performance||R.M. Competition|
|Ben Gorman||Randy Malik|
|Indianapolis, IN||Roseville, MI, 48066|
|Schurbon Engine and Machine|
|Maquoketa, IA, 52060|
|Schurbo@msn.com|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.
For more information, be sure to check out www.moparmusclemagazine.com. We have even set up a Forum Section for you guys to talk to each other, ask questions, or just talk smack before the challenge. Check out the Forum in the Mopar Muscle magazine section.
All the competitors were required...
All the competitors were required to use Edelbrock's Performer RPM cylinder heads this year. ProMax ported their heads along with their intake in-house at their Indianapolis facility.
Purchasing the heads assembled...
Purchasing the heads assembled and utilizing the Edelbrock-installed valves, springs, and retainers saved some cost, and really showed the potential of these heads with some port work.
The intake manifold was ported...
The intake manifold was ported as well for a smooth transition where the intake meets the cylinder head. Attention to details like this are what it takes to place well in a dyno challenge.
Factory style, non-roller...
Factory style, non-roller adjustable rocker arms kept costs down, while offering the necessary adjustability for a Comp solid, flat-tappet camshaft.
While most of the competitors...
While most of the competitors used Dominators or multiple carbs, ProMax used one of their custom blueprinted 850 carburetors, making good power across the board and costing less than a 4500 style carb.
The ProMax entry was likely...
The ProMax entry was likely the most docile engine in the competition, running smoothly and making impressive power. We congratulate ProMax on their fourth place finish in the 2009 Amsoil/Mopar Muscle Engine Challenge.