I talked with MAC and they dont offer a specific P head long tube. They did however tell me to run the standard 1 5/8 long tube header. I have bolted them up and they work. I have to use a 5/8 spark plug socket with the flats on the end and turn it with a 3/4 open end wrench on several of the plugs, but other than that they fit fine. Several of the plug wires come close, but with the SVO $40 wires I have they dont burn. Hope this helps ya.
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