Jon, I have 3 "Bs" and they all have port vac and if you read the shop manual under tune up they never say to remove the vac line from the dist. when you time it.I do, but never have seen any vac at the line when running the B or the W1 at idle, I put a W1 on my 216, I think that the W1 was a production carb built and installed at the factory and thats why it has port vac.I just put that YF4480s and when I had it installed I had full vac advance at idle.It made a difference on my engine at idle it just did not run right .
I was looking at the YF that I have and it would not be that hard to drill a hole on an angle to convert it to port vac.and plug the old hole ,I could always switch it back .I hate to do that to a stock carb and I'm no carb expert ,I just really hate the "B" thats on her now.I had such good performance from the W1 on my 216 I was hopping to get the same from the YF. Or just look for a port vac YF do You know if the 966s or the 967s has port vac?
Again,Thanks,Jon
Pete
