Of all the technical subjects we write about here at Mopar Muscle, our annual engine challenge always gets a great response, and why not? Where else can you see eight of the country's best engine builders compete head to head exclusively with Mopar iron, with true dyno numbers to back up their proven combinations? Since our challenge factors not just the power of each engine, but also the cost of the each engine's parts, the builders have to be creative to be competitive.

This year, our engine challenge features the small-block Chrysler powerplant, and we've already chosen the eight engine shops that will compete. We look forward to seeing what kind of numbers their potent LA engines will produce.

2007 participants
Diamondback Engines
7723 FM 723
Richmond, TX 77469
281/238-6900
diamondbackengines.com
Indy Cylinder Head
8621 Southeastern Ave.
Indianapolis, IN 46239
317/862-3724
indyheads.com
Mid America Racing Engines
1945 W. 18th St.
Washington, IA 52353
319/653-6282
midamericadb@lisco.com
MRL Performance
4651 Culley Ln.
Jackson, MI 49201
517/569-2672
mrlperformance@peoplepc.com
Muscle Motors
2085 Glenn St.
Lansing, MI 48906
517/482-4900
musclemotorsracing.com
R.M. Competition
28648 Maple
Roseville, MI 48066
586/909-1591
rmcomprandy@yahoo.com
Schurbon Engine and Machine
203 S. Clark St.
Maquoketa, IA 52060
563/652-3100
schurbon@qwest.net
Speed-O-Motive
131 W. Lang Ave.
West Covina, CA 91790
626/869-0270
speedomotive.com