RE: Thunder Tiger Engine Mounting
Something else to consider is it's not unheard of to enlarge the mounting holes in the engine, or even to drill a new set to match an exsisting mount. I actually just did this for an OS .81 that I installed in my Sprintcat. I was faced with a decision of drilling new holes in the engine or tapping a second set of holes in the speedmaster mount. In the end, I chose to drill new engine holes.