Words by Richard Kratz,
photos by Richard Kratz and Arrington Performance

As delivered from the factory, the latest generation 6.4L, 392 ci, Mopar HEMI is one of the great engines of all time. Rated at 470 horsepower and 470 pound feet of torque the output alone is among the highest in Mopar mainstream production history. The 2013 models achieve about 23 mpg, idle smoothly, meet the latest emissions requirements and do it all with comfort and style.

But we’re not normal, we’re performance enthusiasts and while 470 horsepower is awesome, we want more. MoparMax’s Project Maulin’ Magnum is a 2007 Dodge Magnum SRT8 street/strip car. And when we say street/strip, we mean it. The Maulin’ Magnum racks up about 15,000 miles a year on the streets and in 2012 put in over 300 runs at the drag strip. The car competes in multiple points series—in 2012 we competed in NHRA, PSCA and WCHRA races. Senior Editor Alex Rogeo (who drives the car) took runner up in the 2012 Pacific Street Car Association’s Street Muscle championship. Up until very recently the car also pulled its own 6’x12’ enclosed trailer all around the southwest to races.

With 60,000 miles and over 600 drag strip passes on the engine, most of them with either a 150 hp shot of nitrous or the current Magnuson supercharger, the factory stock 6.1L was getting a little old. While the engine ran great, didn’t burn oil and seemed fine, we felt it was better to freshen the motor on our schedule than to rebuild it if it broke on its schedule.

We have always had tremendous respect for Arrington Performance. Started by Buddy Arrington the company spent decades building Mopar race engines for the Arrington NASCAR team and other circle track teams at all levels. The company has deep in its DNA a fanatical approach to quality and performance and thankfully for us expanded its focus many years ago to include drag racing and modern high performance late model street cars. So we decided to talk to them about the new engine for the Magnum.
The gleaming halls of Arrington Performance in Martinsville, VA. Note that these are not the halls of the administration offices. No, these are the halls of the shop floor. Doors on the left and right lead to cylinder head flow rooms, head machining rooms, engine tear down, and engine assembly. The facility has more in common with a laboratory than a garage.