1970 K5 Blazer A/C questions

[BurnoutNova]

im in the middle of redoing the a/c on a 70 blazer at school for a friend. its all original, factory parts.

i belive its a frigidare R5? radial compressor... the sticker is uclear off capacity of refigerant. it says 3.25lbs in one spot and 4.25 in another... i think this one uses 3.25 and this same compressor was available on suburbans w rear air? am i on the right track?


i took off all the hoses and sent them to a local shop to put new ends on and new barier hose, because the only place i could find any parts for this was LMC, and i dont have time to wait for a week to get the parts. anyway does anyone know how much this 70 K5 needs for r-12 refrigerant and the oil capacity... ALLDATA doesnt go old enough and out service manuals are confusing at school. when i call the dealer in town they look in thier books forever and never give the right info.