Description
GM 10SI High-Output 140 Amp Alternator – Polished
The Ultimate "One-Wire" Charging Solution for GM & Custom Builds
Upgrade your charging system with the legendary GM 10SI Series High-Output Alternator. Combining classic 1970s-80s fitment with modern 140 amp internals, this unit is the perfect solution for muscle cars, street rods, and trucks that need extra "juice" for electric fans, high-end audio, and modern electronics.
Optimized for Performance
- Massive 140 Amp Output: Offers a significant boost over stock 37 amp or 63 amp units, ensuring your battery stays charged even with high draw accessories.
- Superior Low Idle Charging: Featuring an ultra low cut in voltage regulator, this alternator starts charging almost immediately at low RPMs, eliminating flickering lights at idle.
- Simplified 1 Wire Hookup: Designed for a clean, hassle free installation. Eliminate the factory wiring clutter by running a single cable directly to your battery.
- Heavy Duty Internal Construction: Built with high density copper windings and premium steel to maximize heat dissipation and electrical efficiency.
Premium Sleek Finish
- Polished Housing: A durable polished finish provides a clean, understated appearance that complements any engine bay.
- Complete Pulley & Fan Kit: Comes preinstalled with a Polished V-Groove Pulley and a high flow Polished Steel Fan for maximum cooling and belt traction.
- Neoprene Sealed Bearings: High quality seals keep grease in and contaminants out for a long, quiet service life.
Technical Details
Alternator Output Dyno Chart
March Performance Ultra Series alternators are engineered to deliver excellent charging performance throughout the RPM range, including at lower engine speeds. The graph below shows alternator output under both cold and hot operating conditions.
Additional Information
Product Type: |
Alternator |
Amperage: |
140 |
Mounting Off-Set: |
Center |
Finish: |
Polished |
Make: |
Chevy |