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Holley Premium Alternator

Alternator, PREMIUM, 150A-Polished

Part # 197-304 Be the first to write a review
Estimated shipping date: 02/18/2022
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With performance engines pushing redlines up higher and higher, alternators are being forced beyond their design. Holley's premium alternators are specially designed to tolerate 30% higher RPMs than conventional alternators and made in the USA. If you drag race, auto-cross, or just hot-rod your ride, know this alternator won't fly apart on you. Inside the attractive Holley housing is cutting edge technology. Every component was developed to produce cleaner, more efficient output compared to conventional alternators. Efficiency means you get more from a compact package. GM recently adopted this technology for the 2014 and later Corvettes. The attention to cosmetic detail on these units is above and beyond what you would expect too. The entire outside housing has been sculpted for a smooth silhouette that hides the ugly details we think of as alternators. The housings are smoothed to make polishing clean (no buffer cut marks trying to get in tight corners). Even the rear cover is aluminum so you lose that black plastic on your polished alternator. Available in Natural, black, and polished finishes. For that finishing touch, black pulley covers are available to give a simple but refined look on the 197-302 and 197-303. The 197-304 polished alternator already includes a polished cover. These powerhouses fit ALL Holley accessory brackets, as well as 4th generation F-body, most 1998 thru 2004 GM trucks, and many other applications.


  • Works with ALL Holley accessory brackets
  • 150 Amp Output
  • Smaller & Lighter than the large case 197-301
  • Sculpted all aluminum housings
  • Use when size and clearance matter
  • Made in the USA
  • Black and polished pulley covers are available: P/N 97-187 (Black) & 97-188 (Polished)
  • Uses weatherproof plug/pigtail P/N 197-400 (not included)

About Holley

Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to finish, Holley has the parts to make your dream a reality.

Alternator StyleO.E. or 1-wire
Brand Holley
Emission Code5
EngineGM Small Block Gen III/IV (LS Based)
Output150 Amps
Product TypeAlternator
Part Number197-304

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.


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