Realizing this is an old topic, but still unanswered, I figured I should return and update with my experience. John Carillo's new tank works great and fit pretty well in the old 431 chassis. Some minor trimming of the included bulkhead was required for the burner to fit with clearance, but nothing major. I had to make new holes for the mounting feet as the old tank was considerably different in that regard, but considering the overall job that isn't too hard. The exhaust lined up pretty well too. His product passed my pressure testing with zero leak down over 24 hours on all loops and the tank itself. I would recommend his services and products. He also provided timely responses to questions and concerns.
