[Friday]

I was wondering about that....1961 or 61" , if 61' then 3.5" stroke ,glad someone else jumped in.

rubone; wouldnt it be higher rev?
I always wondered about 74" bore and 61" stroke = 64.96cui by my calc close to square.
XR750 and s+s 4 x 4 are square. (not saying pan is up there)
I think Trock was doing that , not sure....

 

[Friday]

That sounds pretty damn good to me , Id expect it to be common in that case , go for revs instead of stroke.
Im guessing the 74 case has larger cavity for the cylinder base and the top of the barrel needs skimming to match the 61 stroke.

like the sound of that knuckle