This year's Engine Challenge has certainly brought attention to the Mopar small-block and its propensity for making horsepower. Engine builders from around the country built some stout small-blocks for our contest, and some of the dyno numbers would have been impressive even for big-block engines. It takes careful planning and hard work to be competitive in our contest, and since cost is just as important as power, parts selection is critical.
Speed-O-Motive and Muscle Motors placed Fifth and Sixth, respectively, in the Mopar Muscle
This month, we'll go inside the Speed-O-Motive and Muscle Motors entries in our contest and detail the parts and techniques each engine builder used to be competitive in our contest.
|Diamondback Engines||Indy Cylinder Head|
|7723 FM 723||8621 Southeastern Ave.|
|Richmond, TX 77469||Indianapolis, IN 46239|
|Mid America Racing Engines||MRL Performance|
|1945 W. 18th St.||4651 Culley Ln.|
|Washington, IA 52353||Jackson, MI 49201|
|Muscle Motors||R.M. Competition|
|2085 Glenn St.||28648 Maple|
|Lansing, MI 48906||Roseville, MI 48066|
|Schurbon Engine and Machine||Speed-O-Motive|
|203 S. Clark St.||131 W. Lang Ave.|
|Maquoketa, IA 52060||West Covina, CA 91790|
Speed-O-Motive is known for building strong performing, reliable engines, and the engine they entered in this year's contest was no exception. Rather than build a purpose-built dyno mule, they decided to bring an example of what they're known for: power and reliability. The Speed-O-Motive entry fired immediately and ran strong, making well over 500 hp even on their qualifying pulls. During their judged pulls, engine builder Tucker Caven tuned their 408ci small-block to the second highest combined power score of the contest at nearly 530 hp.
Like most competitors in this year's contest, Speed-O-Motive used a seasoned factory 360 block as the foundation for their short-block. The machine work was performed in-house. Inside their block, a Scat-forged crankshaft was utilized, along with Scat connecting rods. To keep compression at a pump-gas friendly level, dished CP-forged pistons were employed. Of course, the rotating assembly was balanced by Speed-O-Motive as well. To oil their small-block, a Melling oil pump was combined with a Sunny oil pan and a Milodon windage tray. A Professional Products vibration dampener ensured smooth operation, and a Howard's Cams timing set spun the camshaft.
The right cylinder heads are vitally important to the goal of producing power, and Speed-O-Motive made a slightly unconventional cylinder head choice for their engine. Instead of using factory Magnum heads, or an aftermarket Mopar or Indy head, Brodix B1B-AMC cylinder heads topped this small-block. Though somewhat more expensive than more conventional heads, the B1s are known for their power potential. Speed-O-Motive optimized their heads by installing Competition Products roller valvesprings and porting the heads in-house to improve flow. T & D rocker arms were used to actuate the valves, and a Howard's cams solid roller camshaft and lifters were utilized to actuate the valvetrain. Up top, an Edelbrock Victor 340 single-plane intake was matched with a 1,000-cfm Holley carburetor for induction. The mixture was ignited by an MSD distributor and ran very well-to the tune of nearly 530 hp and a Fifth Place finish in our contest.
Congratulations to Speed-O-Motive for placing so well.
Remember, these aren't high-compression race engines-they all had to run on Rockett Brand
Engine builder and dyno operator Tucker Caven of Speed-O-Motive tuned his stroker small-bl
Though he brought one of the smallest displacement engines to our contest, engine builder
Comp Cams hosted our dyno challenge again this year, offering their research facility, dyn