Started upgrading the alternator today. I found a 140amp CS130 alternator from an '89 Caprice that my local NAPA stocked for $140. Unfortunately the case is larger than the old SI, which didn't fit the adjustment bracket very well due to me spacing the bracket out a bit for the crank sensor bracket, so I went and got one of those turnbuckles (I think that is what they are called?) to adjust the belt tension. The alternator came with a serpentine belt pulley, so I replaced it with a dual groove pulley and will run two belts on it just to make sure it does slip under load. Unfortunately both parts stores closed before I had it together enough to know what size belts I needed to get.
(sorry about the over exposure, I forgot I had the exposure turned up)
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)