Holley 197-303 Premium Alternator Alternator, Premium, 150A-Black

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 percent 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.

Features and Benefits:

• 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) Designed and Tested for 30 percent Higher RPM than Conventional Alternator

Details:

• AC Service Tap: No
• Alternator Style: O.E. or 1-wire
• Amperage Rating: 150 Ampere
• Brushless: No
• Case Color: Black
• Case Material: Aluminum
• Decoupled Or Clutch Pulley: No
• Engine: GM Gen III/IV (LS)
• External Fan Included: No
• External Regulator Included: No
• Fan Type: Internal
• Finish: Black
• Grade Type: Performance
• Ground Type: Negative
• Material: Aluminum
• One Wire Capable: Yes
• Output: 150 Amps
• Pulley Belt Type: Serpentine
• Pulley Groove Quantity: 6.0
• Pulley Included: Yes
• Regulator Type: Internal
• Voltage: 12 Volts DC

Installation Guide: Download PDF

Installation / Product Video: Watch on YouTube

⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.