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Dang Kevin ...You're just not catchin a break with that IMP..Sounds like it needs a complete O/H..with better pistons..,, then why not just stroke it, as pistons come with most kits, While you're in there a better cam , then some better heads while you're doin it , $$$$ Why not $$$$$$$$$$$$$..you know how it go's...Good Luck..Larry

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Yeah, I'm fighting that urge. Knowing there is a full EFI system, a pair of turbos, and more 8 piston calipers collecting dust in the garage is killing me.

I'd be installing the EFI system now if there wasn't 84 ounces of R12 in the A/C system. The upper A/C line is a steel, not rubber, and goes directly across the mouth of the throttle body. No way yo put an air filter on it.
If I change the line it would be the proper time to change the compressor.

It's a big ugly slope to fall down. Best to avoid it completely.

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What we do with R12 is find a buddy who needs some (always someone with an old car who needs some), hook my gauges to the high side on the one car donating the freon and the low side to the recipient, (I use my 134 gauges and 134 adapters on both cars)pinch off the line to the bottle start both vehicles (if possible) and turn on the AC, you can get pretty much all of it out this way (may need to jump the relay to make the compressor keep pumping after the pressure drops too low in the donor car)and it don't go to waste and Al Gore should be happy. When we put the old R-12 system back together we just put adapters on and evac real good and fill with 134. Even if your car is not running you can still get it down under 50 PSI and if you can figure a way to heat the AC system up a little in your car you can get even more out. Whatever you do do not put propane in an AC system ever! there is a shop in town that does and we keep getting exploded condensers to replace