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4 When it comes to engine swaps you can sometimes reuse the compressor fittings, like the standard threaded fittings on this 5.0L swap in this Falcon. Newer engines often use spring lock fittings for assembly line ease and will require an aftermarket solution. Check out Doc’s Blocks [www.docsblocks.com; (888) 910-8844] for a solution to these installs. It has compressor blocks that replace the OE block with a standard #8 and #10 O-ring fittings to connect to standard A/C hoses.