I had problems with the plug wires burning off in my motor home. Turned out it was from a very small exhaust leak from the manifold. Once I got that solved, I stopped having the problem. Just throwing that out there because it took a Lot of wires before I figured it out. got a 454 in the RV and the rusted-out manifolds were custom made and I couldn't find replacements. I ended up putting low profile headers for a corvette on it. the only thing I could find that kept the exhaust from sticking way below the frame. I also had to relocate my oil filter. Wouldn't be able to change it without dropping the header otherwise.
