From the original 389 V-8 to the later model 455s, the GTO has always been about cramming a big motor into a small car, not to mention throwing in some world class handling. So it is perfectly fitting for GM Performance Parts to trade a more modest 346-cube LS1 or 364-cube LS2 for the punched out and stroked LS7, demonstrating just how potent 505 hp can feel in even the 3800-lb Goat. In addition, the completely different chassis could provide yet one more demonstration of unique challenges facing others who wish to transplant the ferocious 427-cube powerplant into their hot rod, and how to overcome them.
Unlike the LS7 Camaro (featured elsewhere in this issue), GMPP chose to employ the stock electronic throttle, E67 computer and mass airflow system. This gave them the opportunity to play around with various spark and fuel tables that would later allow sale of this custom calibrated computer to others looking to complete the swap. The consequence to this was quite a bit more cutting and splicing of the wiring harness to accommodate the new motor. But that was just a warm up, as the crew also had to modify the LS7's oilpan to squeeze under the GTO's engine cradle. Once the dry sump lubrication system and wiring were squared away, a 4-inch induction tube was fabricated to inhale fresh air through a high flow conical filter prior to combustion and exhalation through stock LS7 manifolds, custom mid-tubes and a Stainless Works 3-inch exhaust.
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The LS7 looks right at home with its custom fuel rail covers, 4-in induction tube, and neatly stowed oil tank in the stock battery location. GMPP plans to release the very same custom tuned E67 computer for others looking to complete their LS7 install while using mass air and an electronic throttle, which also requires an accelerator pedal with a position sensor. |
Since the GTO was manufactured for testing purposes only, it has no VIN or sale title. |  |  |