<VV> Spark plug gaps

[Tony Underwood]

At 04:37 AM 9/19/2007, Edelstein and Payne wrote:
>folks,
>     The 1965 shop manual says that the plug gap for the 110, 140 
> and turbo motors should be .030.


This is how the engineers at GM found the engine to do its best work, 
via tests etc. thus their findings that .03 seems to work best 
over-all.


>However, NGK, AC and Autolite all recommend .035


Recommend.   They don't actually know what the plugs are going into.


>for their plugs, but Bosch says .030.  So what do folk normally use, 
>and what do you think works best?  The motor is a 110 with stock 
>points/condensor/coil ignition.


You won't go wrong with the factory recommendations on plug gap 
etc.   After all, it's their engine design and their findings from 
their R&D people.   The plugs are pretty much a standard in that they 
all do the same thing and the gap setting is in response to the 
conditions inside the combustion chamber, ignition source, mixture, 
timing, etc.




tony..