Stealth Pilot wrote:

There is, in fact, an extension on the 150M, and possibly the 150L and later
150F models; but I have never seen the manuals for those. I don't recall
whether ther extension was 2 inches or 3 inches. I believe that the
extension was concurrent with the change to the Clark-Y propeller and a
revised nosebowl/cowl.

Peter

ok that would post date the manual I have.

No extension on 63-69 models in the '70 parts catalog.

Brian W