Sponsored Links (Register now to hide all advertisements)
I was going to suggest a timing problem. If you go out on the road with the timing retarded for a length of time the exhaust manifold will not only get hot, it will turn cherry red. Years ago a high school friend tried to drive his Model A from Los Angeles to San Diego. He had no idea what the spark handle was all about and he had it up. At Huntington Beach, about 30 miles into the journey, he notice a red glow through hole in the firewall. It was dark when he pulled over and opened the hook. The exhaust manifold was glowing cherry red.
Tom Endy