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What valves are you talking about, in the head?

Well here in CANADA eh,most of the RAM D50's did't have the JET VALVES.If your asking intake or exhaust, I would expect it would be the exhaust,or maybe both <img src="/forums/images/graemlins/rolleyes.gif" alt="" />.

"YOU CAN ONLY LEARN SO MUCH KNOWLEDGE IN A LIFETIME..BUT IMAGINATION IS WHAT MAKES THE WORLD GO AROUND"
89 POWER RAM D50 4X4 XCab 2.6L
91 Grand Prix GTP 3.4L
87 Jeep YJ Laredo 4.0L EFI