Product Summary

Many Engines, One Wire Alternator, V-Belt Belt Type

  • Inside mounting ear-to-ear measures a total of 7"
  • Overall length is 10-5/8" and the case O.D. is 5"
  • Specifically designed for the 1955-1964 GM vehicles
  • The pulley is designed to work with a 3/8" wide belt
  • Puts out 65 amp at idle, 75 amp when cruising, 90 amp at the top end

Key Specs

MFG. Part #82051

Need To Know

This Product Will Ship Free

Shipping Policies & FAQs

Quick and Easy Returns

Return Policy


These Powermaster Powergens allow you to keep the authentic looks of a generator with the efficiency of an alternator. They put out 90 amps maximum with 65 amps at idle and 75 amps at cruise and are a simple one wire design.

  • 65 amp idle, 75 amp cruise, 90 amp top end
  • Pulley works with 3/8" wide belt
  • Inside mounting ear-to-ear is 7"
  • Overall length is 10-5/8"
  • O.D. of case is 5"

Fits 1955-1964 GM models (except with generator mounted power steering pump). Choose plain or polished. 




Powermaster's warranty is one year from the date of purchase on all street rod components, and 90 days for any component use for an off road or race application.

Powermaster will provide technical support regarding warranty claims and inquiries directly to the purchaser to help resolve any warranty claims or necessary technical support for warranty resolution. Component or components can be returned to Speedway Motors as long as the product is still under warranty.

All customer service inquiries pertaining to warranty and defect claims are to be handled by Speedway Motors if under one year street or 90 days race. If the product is out of warranty please contact Powermaster direct to discuss their repair and return program.


MFG. Part #82051
One Wire AlternatorYes
Belt TypeV-Belt
Alternator Case StyleGenerator-Look
Alternator Amperage90 amp
Voltage Required12-Volt
Alternator Finish
Alternator MaterialAluminum
Alternator Pulley IncludedYes
Pulley Diameter
Belt Width.375"
Alternator Brackets IncludedNo
Inside Diameter1.20"
Outside Diameter5.00"
Sold in QuantityEach
Belt IncludedNo
Pulley StyleV-belt
Regulator StyleInternal
Regulator IncludedYes