<VV> 4-carb question

[Chris & Bill Strickland]

Bryan Blackwell wrote:

>The secondaries all have stiffer return springs on them, I've never heard of them opening on just the engine vacuum.
>

It would be my understanding that the 66 and later linkages (I've never 
had a set of these) actually have a lockout device to prevent the 
secondaries from opening until the primaries are full open -- if the 
manifold vac doesn't open the secondaries, why would this lockout be 
needed?  Likewise, why would GM have spent the money to change the 
linkage?  The 65 linkage is apparently much simpler, and it will open 
the secondaries.

The only oem return spring I'm aware of on 65 secondaries is the one in 
the accelerator pump hole.

Bill