Never say never, if you operate the engine hard for a long period of time, you can damage seats pretty fast without lead added to the fuel. Just driving around, sure, no problem, but hook up a trailer and head over the mountain a few times, you might be looking for a new head.
If the engine was driven with leaded fuel early on, the seats should have enough lead embedded in them to last a life time if they haven't been cut down too much. Thats how most survive now, along with not working the engine to death.
Running a lead additive solved this heating problem, it colored the plugs, so I would say thats a win. It sure won't hurt adding a can every so often to keep the seats coated, considering the type of truck it is and the amount of wind it's going to be pushing, this engine will work harder than a pickup will.
Really good points. I hadn't realized that if it had been run previously with leaded fuel that there would be lead embedded in the seats which could help it out. Thank you for explaining that.
I do load the rear up from time to time, and I do live up in the hills, so then I will continue to add lead additive from time to time.
Thanks so much for that information.
