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ursus · 03-29-2017, 06:25 PM

I've seen Ford marked valves with the IN, X, and R. The IN and X valves were in the corresponding intake and exhaust positions and the "R: valves were scattered all over. I don't know what the "R" stands for.

03-29-2017, 06:25 PM	#5
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,534	Re: NOS Ford valve question I've seen Ford marked valves with the IN, X, and R. The IN and X valves were in the corresponding intake and exhaust positions and the "R: valves were scattered all over. I don't know what the "R" stands for.