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Ok let me put it this way for you.
If you're planning on removing the AC system to paint the engine bay or anything else like that then you want to switch to 134(a). The retrofit kit doesn't cost that much and the freon is substantially cheaper. If you don't need to remove the AC stuff you might be able to just move the lines out of your way for the engine swap. Then you can just top it off with R12 if it's not too low or leaking.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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