We'll detail some of the secondary modifications below, but first the results of the dyno test and tuning session where the factory computer was re-tuned to accommodate the larger displacement, hotter camshaft and other performance mods that we added to the Summit based stroker engine. One of the first things that impressed us was the fact that the newly modified engine started right up on the factory ECM and ran beautifully with no check engine light. We assumed that 33 extra cubic inches combined with the GM "Hot" cam, 1.6:1 roller rockers, Edelbrock intake manifold, bigger injectors and Holley throttle body would set off alarms. Didn't happen and the car drove well. Any throttle at all off idle easily lights the tires.
The purpose of the chassis dyno test was to fine tune the factory PCM to the new stroker engine package. To accomplish this we enlisted the aid of former Chevrolet Performance engineer Mark McPhail to come out and put the tune on it at Ray McClelland's Full Throttle Kustoms shop in Fillmore, California. Ray has a fantastic shop and a Mustang chassis dyno where he tunes customer's performance cars everyday. We put the two of them together to see if they could put the max demon tweak on it for that last little bit of power and optimum drivability.