rich:
The site with the Jennings material is the result of a Google search.It was also
posted here last year in this forum.Contact the site owner.
I've owned my copy since the late '70's. It still finds it's way into the "library" from time to time...


Ram jet:
Jennings pipe formula is getting pretty old in the tooth now. 35+ years...
Tons of modern software out there now for manufactures to purchase.
All kinds of brand/design comparisons to be found on the boards,mags,etc.


Here is an interesting hot rod chainsaw forum... porting,carbs,muffler mod's,etc.

http://www.arboristsite.com/forumdisplay.php?f=9