The intake ports on my TFS R intake are about a 1/16" bigger on the outer edge the ports of my P51's, should I have the heads opened up or have the intake welded it epoxied?
I'd like to ask you to double check that carefully. The TFS Mafia intake port is narrower than the P-51 intake port. Height wise, it might be just a little taller, depending on deck height of the block, and or how much the heads have been milled. If so, the easiest option is to raise the roof of your P-51 heads by porting. No welding is necessary imo.
The sides of the port is where the majority of the mismatch is.
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