Powermaster 57297 GM 12SI 150 Amp Smooth Look Alternator, Black
Universal Fit, Is One Wire Alternator, V-Belt Belt Type, GM 12SI Alternator Case Style, Black
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Powermaster's most popular GM alternator fits most models, 1965-'85 with straight mount 6.61 inch bolt spacing.
- Works as 1 or 3 wire operation
- Internally regulated
- Pulley included, single groove
- V-belt style
- 150 amp with 90 amps at idle, and 125 amps at cruising speed
- Black finish with fan baffle and custom Smooth Look
Powermaster Alternator FAQ's (Link)
See the difference between the popluar alternators we offer by reading our tech article, GM Alternator Buying Guide (Link) and learn how to correctly install your new 1-wire alternator by reading our tech article, 1-Wire Alternator Conversion (Link).
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.
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Q & A
Kevin W. walks through each step of installing a new alternator bracket on a 454 Big Block Chevy.
Learn how to select a GM style alternator for your street rod or muscle car application.
Brief review of the different types of Ford alternators and regulators available through Speedway Motors.
One wire alternators offer a simplified installation and a clean setup.
These are the specifications for the alternator and A/C brackets from Bill's Hot Rod Company available at Speedway Motors.
A routine weekly maintenance checklist to perform between each race in order to keep a clean and efficient race car at the track.
In preparation to transplant a 430hp 383 stroker into Project Chevelle, Zach R. made up a set of plug wires for the car. To keep it nice and tidy they needed to be routed just right, be the perfect length and not distract from the engine!
Follow along as Product Guru Jeff K. works his magic on a rather depsondent looking Chevy engine, bringing it back to its former glory.