Originally Posted by Wrenchbender Ret.
The 150 amp. alt. will put too much load on the belt. The 6 cyl. engine has a very small contact area on the alt. pulley. The belt will squeal & glaze the belt & pully. All the late model vehicles with high amp alt. use Serpentine belts.
Most of the time the bat will not be low enough to put a large demand on the charging system, but we all know at times we leave something on for a while or it takes longer then normal to start the engine especially in cold weather or after it has set for a long period of time. That is when a large amp. flow takes place.
You might get by by over tightening the belt but that puts a stain on the water pump.
The 60 r so amp alt. is all you need for the standard accessories. The original gen put out about 30 amps & 0 or almost at idle & we drove them for many years that way.
The alt. is a tremendous improvement but there is no reason to go overboard.

George

I haven’t pulled the trigger on this yet. I’ll probably wait too long and the opportunity will pass anyway

1951 3100