Mast Motorsports built L92 427 out of an L92 376, M90 ECM & wiring harness; PCS Transmission Controller; Callies 4.100 crank; Diamond pistons; LS3 Custom Cam; L76 Intake manifold; LS4 water pump, pan & harmonic balancer; HP/Torque (at engine): 621 hp, 555 lbs torque
Here is the previous owner having some fun at the 2010 Fiero Dells Run
Racing Fiero Burnout - YouTube