I went through a lengthy AC dilema when switching from R12 to R134 freon and I didn't hear or learn anything that would make that true. But you should replace them if you do ever convert to R134.
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1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers
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