<VV> Early to late 110 head changes

[Bryan Blackwell]

Thanks Bob!  Great bit of info, but one note - with the thickness of  
the gasket (.032" as I understand it), I don't really think there was  
any quench effect anyway, since the total distance, even on the late  
heads would be .082".

This does explain why owners of earlies seem to complain less about  
pinging, since the CR was a bit lower.

--Bryan

On Jan 6, 2009, at 11:36 PM, BobHelt at aol.com wrote:

> Chevrolet, in its conservative fashion, designed the squish gap to  
> be  0.050"
> for the 1960 Corvair engines.  But then, for reasons unknown,  
> increased the
> gap to 0.107" for the 1961-64 non-  turbo engines. This of course  
> lowered the
> detonation resistance but was never  known to be a problem.
> During the mid-1960s, as the muscle car market emerged, Chevrolet was
> anxious to gain every possible horsepower from their engines and  
> did so on the  1965
> Corvair engines too.
> So, for 1965 and following thru 1967, they reduced the squish gap  
> down to
> 0.054" for all non-turbo and non-AIR  engines. This made a quarter- 
> point
> increase in the compression ratio (1964 to  1967) that boosted the  
> net horsepower.
> (Advertised horsepower remained the  same.)
> Regards,
> Bob  Helt