MAXIMUM OUTPUT 140AMPS IS ACHIEVED AT OVER 1200 ENGIEN RPM. IT FITS ALMOST ALL GENERAL MOTORS ENGINES FROM. Full output of 140 Amps is achieved at over 1200 engine rpm.For safety, we recommend installing a fused 4 gauge main. Charging wire to allow maximum current flow to your battery. The item "140AMP ALTERNATOR Fits CHEVROLET GM GM SBC BBC CHEVY 1 ONE WIRE HIGH OUTPUT" is in sale since Monday, December 21, 2020. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Charging & Starting Systems\Other". The seller is "rzalternator" and is located in Burbank, California. This item can be shipped worldwide.