Luiz

Currently in my 69 GTO 400 4bl, I have a three port thermostatic/ported vacuum switch. One line goes to distributor vacuum advance, one to back of carb and the third goes to top front of carb.

I noticed another port on the side of my carb which goes nowhere. Pictures in the Restoration guide shows a line from here going to the vacuum switch.

Also the restoration guide shows what looks to be a five port switch. One line goes to the distributor vacuum retardation port which I do not have (because not CA requirements??).

So, am I suppose to have a five port switch? What do I do with the port that suppose to go to the distributor vacuum retardation port?

Thanks!