The Test
Using Westech's engine dyno, we swapped out a Road Demon 525 for a larger Speed Demon 825 on a mild 305 small-block with Vortec iron heads, Crane 1.5:1 roller rockers, and an Edelbrock Performer RPM air gap intake manifold.
Before
Max power: 345 hp @ 6,000
Max torque: 341 lb-ft @ 4,400
Average power: 265 hp
Average torque: 320 lb-ft
After
Max power: 360 hp @ 6,000
Max torque: 341 lb-ft @ 4,100
Average power: 268
Average torque: 318
Difference: +15 hp; +0 lb-ft
Demon Carburetion
706.864.8544
barrygrant.com
Fast Fuel Injection With 90mm Throttle Body
The Test
We swapped the carbureted setup on this LS1 with SLP cylinder heads and stock rockers to a more efficient FAST system. We also threw an MSD ignition on top with a 90mm throttle body and 55 lb/hr injectors.
Before
Max power: 564 hp @ 6,500
Max torque: 504 lb-ft @ 5,200
Average power: 469 hp
Average torque: 488 lb-ft
After
Max power: 586 hp @ 6,400
Max torque: 518 lb-ft @ 5,000
Average power: 460 hp
Average torque: 484 lb-ft
Difference: +22 hp; +14 lb-ft
Fast
877.3348355
fuelairspark.com
Classic Performance Products Sos Big Brake Kit
The Test
A '69 Chevy Nova was outfitted with CPP's Big Brake Kit. Out went the four-way drums in favor of a four-wheel disc set, including 13-inch discs in the front with 12-inch discs in the rear. The calipers were also swapped with new lines.
Before
60-0 mph with OEM brakes: 188 feet
Peak deceleration force with OEM brakes: 0.89 g
After
60-0 mph with CPP kit: 128 ft
Peak deceleration force with CPP kit: 1.12 g's
Difference: -60 feet; +0.23 g
Classic Performance Parts
800.522.5004
classsicperform.com