Recently I got my hands on a 66 Ford 200ci straight six. I decided to swap the old tired 170 that was in my 1962 Ford falcon with this engine after a mild rebuild. Since this is my first car and rebuild, I was a bit nervous. I pulled apart the 200 and honed the cylinders, replaced the rings, and put on all new seals throughout. I did however leave the old main bearings because they were in great shape (plasti-gauged nicely). I also replaced the rods but left the valves. Everything went together very nicely and the engine turned smooth on the stand. This past week I put the engine in the car and it fired right up pretty easily. But it's much much noisier than expected. The exhaust is tight and there are no knocks or taps it just sounds like a diesel. Could this just me a timing thing? Tuning thing? Or is it something else inside the engine? I appreciate any knowledge you all can provide, and I'll answer any questions that might help you respond. Thanks so much!