On stockers, usually it serves to act as an attachment point for the PCV hose and adds a little more plenum space which helps with low-end torque...
If you decide to get one for your 4V, likely the throttle linkage won't need anything..it hasn't on my race car or D-coder and I have phenolic spacers on both...
BTW, get a phenolic spacer vs the aluminum one....the phenolic one insulates the carb from manifold heat better....
You can see one in action on my race car...note the wooden-looking thing under the carb....also note the throttle linkage and return spring arrangement...
I believe you can get one from Summit for about 30 bucks...
Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg
If you decide to get one for your 4V, likely the throttle linkage won't need anything..it hasn't on my race car or D-coder and I have phenolic spacers on both...
BTW, get a phenolic spacer vs the aluminum one....the phenolic one insulates the carb from manifold heat better....
You can see one in action on my race car...note the wooden-looking thing under the carb....also note the throttle linkage and return spring arrangement...
I believe you can get one from Summit for about 30 bucks...
Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg