Here at Mopar Muscle, we’ve always had the opinion that when it comes to performance, numbers don’t lie. And while we’ve all been to car shows, cruise nights, or even the racetrack and heard car owners making claims about how much power their Mopar makes or how quick it will go in the quarter-mile, the proof is only realized when that car is strapped to a dyno or makes a pass down the track. So when it was time to come up with a contest to replace the annual engine dyno challenge held at Comp Cams for the past seven years, we felt a chassis dyno competition would be a great way to let our readers not only experience the event, but participate as well. This year marked the First Annual AMSOIL/Mopar Muscle Numbers Don’t Lie Dyno Showdown, held at the largest Mopar-only event in the country, the Mopar Nationals, and the response has been better than we ever expected.

For this year’s contest, we accepted applications from our readers and chose 20 Mopars to compete in two classes on the chassis dyno. The normally aspirated class featured only cars that had no extra help from superchargers, turbos, or nitrous-oxide, and the power adder class allowed one of the above aids to help spin the dyno rollers. We had a variety of early- and late-model Mopars in this year’s competition, and even some Ram trucks and Dodge Dakotas in each of the two classes. All of the cars were street legal and had to wear license plates to be eligible to compete. And if you were at the Nats this year, we’re sure you were just as impressed as we were with the power these Mopars made.

Because one of our competitors had to decline due to a mechanical issue but then made a quick repair, we actually ended up with 21 vehicles competing in the Dyno Showdown since we had already allowed our first alternate vehicle to make dyno pulls. In previous issues, we featured 12 of the contest Mopars in random order, and in this issue we’ll show you the remaining seven and the combinations they used to make their power numbers. As for the winners, they’ll each get their own feature article in Mopar Muscle. If you missed the AMSOIL/Mopar Muscle Numbers Don’t Lie Dyno Showdown at this year’s Mopar Nationals, you won’t want to make that mistake twice. This event drew a huge crowd and will only get better as we expand the classes for future contests.

This year’s competition featured early- and late-model Mopars, and even Dodge Ram trucks. If you think your Mopar has the power to compete, be sure to enter next year’s Dyno Showdown for the chance to win prizes and have your car featured in Mopar Muscle.

Ben Leonard
1970 Dodge Charger R/T

Having grown up watching the Dukes of Hazzard, Ben Leonard of Addison, Michigan, always loved second-generation Chargers. Ben brought a beautifully restored ’70 R/T model to our contest, which he has owned for more than ten years. As a red car with a white interior, black vinyl top, and black R/T stripe, this Charger is nothing less than stunning and features a 440hp engine and 727 transmission. During the rebuild, Ben had Muscle Motors modify the factory big-block with Ross forged-pistons, a Comp Extreme Energy camshaft, and ported and polished 906 cylinder heads. The engine is topped with an Edelbrock Performer intake manifold and Demon four-barrel carburetor, with TTI headers to expel the gasses through three-inch exhaust and Flowmaster mufflers. The transmission is a 727 short version built by SMR and features a Gear Vendors over/underdrive unit. On the dyno, Ben’s B-Body spun the rollers to the tune of 262 rear wheel horsepower.

Bill Cherry
2011 Dodge Challenger SRT8

Liking the looks and performance of the new Dodge Challenger, Bill Cherry of Brownsburg, Indiana, purchased an SRT8 model as soon as the 2011 versions hit the local dealer’s lot. Bill’s Challenger features the factory white paint and is nicely accented with blue stripes. To optimize the power of the factory 392-inch Hemi, Bill added a cat-aft exhaust system from Zoomers, a cold-air induction system, and a Paramount 3,000-rpm stall converter for the NAG1 automatic transmission. At 4,250 pounds and equipped with a 3.06:1 rear gear ratio, Bill’s Challenger has run a best elapsed time of 12.12 seconds in the quarter-mile at a speed of 111.80 mph. On the dyno at the AMSOIL/Mopar Muscle Numbers Don’t Lie Dyno Showdown, Bill’s normally aspirated Challenger posted a very respectable 409 horsepower at the rear wheels.

Lonnie Jefferson
1967 Dodge Coronet

We love the boxy look of the ’66 and ’67 B-Bodies, and Lonnie Jefferson brought a nice example to our contest. Lonnie’s ’67 Polar White Dodge Coronet is equipped with a .030 over 440 big-block, featuring Six-Pack rods, a factory steel crankshaft, and JE forged pistons. The cylinder heads on this big-block are factory 452 castings with 2.14 intake valves and 1.81 exhaust valves and the engine is equipped with a Mopar Performance hydraulic flat-tappet camshaft with .509 lift and 292 degrees of advertised duration. Topped with a Victor 440 intake and 850 Holley carb, this big-block features headers and exhaust from TTI, MSD ignition, and Crane rocker arms. The automatic transmission is equipped with a shift kit and TCI 3,500-rpm stall converter, pushing the power through a Dana 60 rear end with Super Stock springs and Strange axles. On the Dynotune chassis dyno, Lonnie’s Coronet made 369 horsepower at the rear wheels in our normally aspirated class.