Quick view Mechman 240 Amp Alternator for GM 4.2 6 cylinder with 4 pin plug Now: $349.00 MSRP: $449.00 Was: G Series Based on our late model large case GM housings, the tried-and-true G series of alternators are our best sellers. Reasonably priced, these units feature solid copper custom rectifiers with huge 65 amp diodes for great dura… Choose Options Add To Compare