I've heard the story [possibility of warping valves] but never had any problems, what I do when running an engine with no exhaust [just manifold] is stuff rags in the outlet as soon as it's shut down .... I doubt it's a real serious problem
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
