I asked my local shop about Freeze 12 vs. R-134 conversions. He put Freeze 12 in his '67 Chevelle and is very happy with it. He's done quite a few Freeze 12 set-up's and had no complaints. With a 134 conversion, he says that most are happy, but a few come back saying it doesn't cool well enough. It appears that the 134 is somewhat picky about going into an older style system and may or may not provide enough cooling.
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'67 GTO Conv 400 TH400
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