I did some more running today I ran a 15 x fox, veco 19bb, a 4 bolt head Veco 35,And 3 Fox 35's my 68 with a Fox hemi kit liked the muffler a lot more than the mid 70's engine with the muffler lugs. The old Veco really surprised me it is a real stout engine and packed some real pulling power, I need to cut some new gaskets for it as it was blowing castor bubbles at a lot of its gasket joints. All the engines are headed for planes except the 58 fox and the old veco the Fox needs some teflon pads or something on the wrist pin to keep it from wearing into the liner and the Veco 35 is probably going to be displayed in my office for now. I gotta get some more needle valves,props and glow plugs I got a bunch more engines to try out. Having a blast T.J.