[NoVa-Corvairs] Noob May Need a Good Used Head

[corvairduval at cox.net]

Right, 110 HP smog engines used open chamber heads and pop up pistons to get the compression ratio correct.

If you bolt quench heads (regular 64-67 110 HP heads) onto smog engine with pop up pistons, there is an interference fit, i.e. no go!

140 HP engines never had open chamber heads or pop up pistons, 65 to 69 production.

Frank DuVal


---- Bryan Blackwell via Novacc-list <novacc-list at corvair.org> wrote: 
> Darrin,
> 
> I was under the impression that the AIR engines used pop up pistons to get the compression back, the open chamber heads run cooler which is the reason they're used.  Not sure you can just bolt standard 110 heads onto a smog engine.
> 
> --Bryan
> 
> > On Mar 8, 2017, at 2:16 PM, Darrin Hartzler via Novacc-list <novacc-list at corvair.org> wrote:
> > 
> > If I were going this far, I would pull both heads and put higher compression 110 heads on for more power with no other changes.   Low compression allows you to run regular gas, but does not give the excellent pep one expects from a stock 110.
> > 
> > I have several sets of 110 heads, a few of which I would be tempted to run as is.   
> > 
> > Just a thought as you are digging into the engine.  Seems a shame to me to spend money on deep seats for an open chamber smog head.
> > 
> > Best,
> > Darrin
> 
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