Powermaster 8-721 CS121 Pro Series 100 Amp Kit, 1V Pulley
Universal Fit, One Wire Alternator, GM CS121 Alternator Case Style, 100 amp Alternator Amperage
This kit mounts the alternator to the passenger side cylinder head area and drives off the front of the water pump with a 1V belt pulley system. This setup does not interfere with other belt drive systems already in use. The alternator produces 60 amps at low RPMs and 100 amps at racing speed.
- Powermaster 8-721
- CS121 Pro Series 100 Amp Kit for Circle Track
- 1V pulley included
- 60A at idle, 100A top end
- True 1-wire hookup
- Black finish
- 3:00 position alternator - 8072-3
- Water pump pulley - 174
- Alternator pulley - 181
- Bracket - 722
- Gates Belt - 7240
- This item ships directly from the manufacturer. It may take an additional 2 business days for Powermaster to ship this item.
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
- This item ships via Ground Shipping only. Expedited and Air shipping options are not available.
More Like This
Powermaster 8-721 SB Chevy 100 Amp Mini Alternatorw/ V-Belt Kit
Powermaster 8-7228 CS121 Pro Series 100 Amp Kit, 3-Groove, XS
Powermaster 28163 Denso Style Race Alternator, 75A, 100mm, Polish
Powermaster 8163 Denso Style Race Alternator, 75A, 100mm, Black
Powermaster 8174 Denso Style Race Alternator, 75A, Natural, XS
Powermaster 37296-360 GM 12si Alternator, 150A, 6-Groove, Brushed
Powermaster 378608 GM CS130 XS Alternator, 140A, Chrome, Right
Powermaster 378618 GM CS130 XS Alternator, 140A, Chrome, Left
Powermaster 37902 GM CS130 140A Chrome Alternator, 6-Groove, Left
Powermaster 384831 GM CS130D Alternator, 165A, 6-Groove, Chrome
Q & A
Pat talks about our red solid core spark plug wire and rajah ends.
Looking for an easy performance upgrade to your ignition system? MSD's line of Ignition Control Boxes offer extreme improvements to drivability and high rpm applications. Here's a look at the differences between the 6 series line-up.
Learn about GM alternator identification in our guide. We cover GM 3 wire alternators, 1 wire alternators, and externally regulated so you know what to choose.
Check out our one wire alternator conversion guide. We cover GM 1 wire alternator wiring as well as Ford and Chevy. Learn about pulley ratio and charging too!
Brief review of the different types of Ford alternators and regulators available through Speedway Motors.
Kevin W. walks through each step of installing a new alternator bracket on a 454 Big Block Chevy.
These are the specifications for the alternator and A/C brackets from Bill's Hot Rod Company available at Speedway Motors.