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.

2009 participants
Chenoweth Speed and MachineJD Engine and Machine
Mike ChenowethJeff Dickey
Morton, IL, 61550Columbia, MO, 65203
309/266-8084573/445-4550
chenowethspeedandmachine.com
LaRoy EnginesMid America Racing Engines
Jim LaRoyDavid Bruns
Challis, ID 83226Washington, IA 52353
208/ 879-2969319/653-6282
jglaroy@custertel.netmidamericadb@iowatelecom.net
Promax PerformanceR.M. Competition
Ben GormanRandy Malik
Indianapolis, INRoseville, MI, 48066
317/484-1451586/909-1591
sales@promaxcarbs.comrmcomprandy@yahoo.com
Schurbon Engine and Machine
Scott Schurbon
Maquoketa, IA, 52060
563/652-3100
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.

SOURCE
Schurbon Engine And Machine
Maquoketa
IA  52060
563-652-3100
schurbon@msn.com
Chenoweth Speed And Machine
368 Erie Avenue
Morton
IL  61550
309-266-8084
http://www.chenowethspeedandmach
ine.com/
Mo-Par City
Oregon
IL  61061
815-732-7751
http://www.moparcity.com/
JD Engine And Machine
Columbia
MO  65203
573-445-4550
Mid America Racing Engines
Washington
IA  52323
319-663-6282
midamericadb@iowatelecom.net
ProMax Performance
Indianapolis
IN
317-484-1451
sales@promaxcarbs.com
LaRoy Engines
Challis
ID  83226
208-879-2969
jglaroy@custertel.net
R.M. Competition
Roseville
MI  48066
586-909-1591
rmcomprandy@yahoo.com