Camaro / Firebird/ GTO
What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality.
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NEW SFI (approved) LS-1 Camaro / Firebird Pulley Kit  |
1998-02 LS1 25% Harmonic Dampner Crank, 15% Alt. Pulley Kit
ASP LS1 underdrive pulley kit reduces parasitic power losses associated with high accessory speeds, freeing up additional HP. It also reduces the rotating inertia on the front of the crankshaft allowing for faster revving. We have seen just over 13 rear wheel hp increase with this kit installed on stock LS1s. |
Camaro / Firebird Street Pulleys:
Black Nitride (Serpentine) .20 + Second Quarter-Mile Gain ASP540801 |
Nitride Overdrive Alternator Pulley
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"LT-1" 2 pulley Kit:
"LT-1" 34% Add-On Crank Pulley 15% Alternator, .1 to .15 Second Quarter-Mile Gain ASP847601 |
| Year |
Engine |
Pulley Description |
Full Charge |
Nitride |
Hard CoatBlack Alum |
| 98-06 |
LS1 350 |
25% Harmonic Dampner Crank |
800 RPM |
ASP948500 |
-- N/A -- |
| 98-02 |
LS1 350 |
25% Harmonic Dampner Crank15% Alternator |
950 RPM |
ASP948584 |
-- N/A -- |
| 93-97 |
LT1 350 |
34% Crank |
950 RPM |
-- N/A -- |
ASP847600 |
| 93-97 |
LT1 350 |
34% Crank15% Alternator |
1050 RPM |
-- N/A -- |
ASP847601 |
| 93-97 |
LT1 350 |
23% Crank |
800 RPM |
ASP945100 |
-- N/A -- |
| 93-97 |
LT1 350 |
23% Crank15% Alternator |
900 RPM |
ASP945103 |
-- N/A -- |
| 88-92 |
305, 350 |
25% Crank |
800 RPM |
ASP540800 |
-- N/A -- |
| 88-92 |
305, 350 |
25% Crank23% Alternator |
950 RPM |
ASP540801 |
-- N/A -- |
| 88-95 |
2.8, 3.1, 3.4 |
25% Crank |
900 RPM |
ASP541800 |
-- N/A -- |
| 88-95 |
2.8, 3.1, 3.4 |
25% Crank23% Alternator |
1100 RPM |
ASP541801 |
-- N/A -- |
| 85-87 |
305, 350 |
25% Crank |
750 RPM |
ASP541100 |
ASP841100 |
| 85-87 |
305, 350 |
25% Crank23% Alternator |
1000 RPM |
ASP541101 |
ASP841101 |
| 82-85 |
305, 350(3V-Groove) |
25% Crank |
750 RPM |
ASP541300 |
ASP841300 |
| 82-85 |
305, 350(3V-Groove) |
25% Crank12% Alternator |
950 RPM |
ASP541302 |
ASP841302 |
| 69-85 |
305, 350(3V-Groove) |
25% Crank8% Water Pump12% Alternator |
950 RPM |
-- N/A -- |
ASP841322 |
