Head for O.S. Max H29R
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Since no one has yet responded, I'll throw in my two penn'uth for what it's worth. In playing around with many of the O.S. Max engines, I have discovered some parts are common to various engines, and, not quite the same thing, many parts are interchangeable. I like to put appropriate engines in models, and when the original model was designed in the non-silenced era, using the correct engine with a muffler today often results in an underpowered model. In this case I like to find an engine of adequate muffled power, as near as possible to a "correct" engine. For example, a muffled Fox 40 with a light silencer can be a good substitute for a Fox 35, although a little heavier.
One of the best engines I've come up with so far is an O.S. Max-H 35 c/case which accepts enough O.S. 40 parts to make it a 40. So I have a muffled 40 which even says 35 on the case, and has the required power.
My point is you may find what you'r looking for as a head from another O.S. 29/30/35 or 40. Sorry I can't be more specific. Incidentally I don't think you specified whether it's a Max-III 29R or a Max-H 29R. On these the heads probably are different.
One of the best engines I've come up with so far is an O.S. Max-H 35 c/case which accepts enough O.S. 40 parts to make it a 40. So I have a muffled 40 which even says 35 on the case, and has the required power.
My point is you may find what you'r looking for as a head from another O.S. 29/30/35 or 40. Sorry I can't be more specific. Incidentally I don't think you specified whether it's a Max-III 29R or a Max-H 29R. On these the heads probably are different.
Ian R.