I have a 1979 B300 with a 2 bbl 360 engine. I want to upgrade the stock
65A single-groove pulley alternator to a high-amp double-pulley alternator,
and also to upgrade the old York single-groove pulley A/C compressor to
a more compact and modern model that has a double pulley.
I'm disappointed that I cannot find anything about belt strategies online
after considerable searching!
The current belt layout with the single-groove alternator pulley is thus:
INNERMOST: Crank, Alternator, Water pump
MIDDLE: Crank, Water pump, PS pump, AIR pump
OUTERMOST: Crank, A/C, Idler pulley
My current thinking is that my new layout will involve (a) eliminating the
A/C idler pulley completely, and (b) keeping my current 3-groove crank
pulley - and that the new arrangement will end up thus:
INNERMOST: Crank, Alternator, A/C, Water pump
MIDDLE: Crank, Alternator, A/C, Water pump
OUTERMOST: Crank, PS pump, AIR pump
In this arrangement, the double-belt path would be tensioned by a very nice
billet alternator tensioner I've bought, and the PS and AIR pump belt
tensioned by the adjustment of the PS pump.
QUESTION 1: Does anyone have any diagrams or pictures of factory belt
layouts for this application?
QUESTION 2: Does my plan make sense? Does it match the arrangement of
models that shipped stock with dual-pulley alternators? In other words, do
dual-pulley belt layouts drive off of the same three-groove crank pulleys
from the innermost two grooves?
QUESTION 3: Assuming this plan makes sense, when shifting the PS and AIR
pumps outwards to the outermost pulley slot, is it better to (a) find
appropriate stock brackets at the junkyard, (b) make shims as required, or
(c) find alternate pulleys with the required alignment, or (d) otherwise?
Thanks in advance for any useful feedback!