Ralph,

If you want to know, I'll get hold of a PT model 18x6 and toss it on one of your G26's and let you know. I'm not sure but I do own a few 22 and 23 inch PT model one and they look very close to the Mezjlik's almost to the point of calling it a clone.

The engine I'm referring to runs the Mezjlik 18x6 currently and has been a real powerhouse on a Super Stearman. It's been so long since I actually tach'd it I do not remember what I am getting but it was right where you sais it should be when I first got the engine