Had a '88 D50 w/2.6 & was running on natural gas .The former owner before me had it removed,don't know why though <img src="/forums/images/graemlins/rolleyes.gif" alt="" />?It did have a certified sticker under the hood saying"THIS ENGINE HAS BEEN MODIFIED TO ACCEPT NATURAL GAS". So I think what this means is that the valves & seats were changed to accept the burning of natural gas ,I think this goes for propane also? <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