Another Dizzy question

[Anonymous]

Well because I have switched to a Weber carb on my 67 200, I need to either go with a DS II or a dizzy from a 68. I am looking at the dizzies from 68 and there is a single diaphram and a dual diaphram. Which one of these will be the right one to get if I don't go with the DS II? Any help will be greatly apprecaited. Thanks!!

 

[66 Fastback]

My preference would be the single port vacuum cannister and hooked up to manifold vacuum. The dual port cannister is intended to retard timing at idle. It can be run such that you only operate with the outboard port or nipple (advance side) connected to a vac source. However, I am not sure that the spring rates between a single port and a cual port vac cannister are the same. Sometimes, you and adjust the spring tension with an allen wrench inserted into the nipple.
Doug

 

[Anonymous]

thanks for the info!!!