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I own several ST Blueheads. All of mine are ABC/ring with no baffle on the pistons. There are many variations out there in the world.

When the Bluehead gained its reputation in my neck of the woods, it was mostly used in the configuration that I own. I have never seen an ST Bluehead come stock from the factory with a baffled piston, although some folks claim that they have. I'll believe them. I have no reason not to, but none of mine are baffled piston engines.

While mine are not baffled piston engines, mine are not schneurle ported engines. This is where some of the confusion comes in, I suppose.

My Blueheads weigh very close to 20 ounces without a muffler or a header. By today's standards, that is really light for a .60. There are so many iterations of this engine that I would not consider my figures as being written in stone.

When hotrodding my Blueheads, I run 11x6 to 11x7 props and use an open front muffler (Mac's). Why? Because that is what came with the engines when I got them from a friend. He used to run them with tuned pipes and they howled pretty good. No, they were not as powerful as say an OS .61FSR or a Webra Speed .60, but the Bluehead was close.

If you already own either engine, I would use the one you own.