<VV> 110 vs 140 Heads

[jvhroberts at aol.com]

 I don't think the 140s run hotter, it's just that the larger seats produce a larger change in dimension for the same temperature, hence the greater tendency to drop seats. 

And why several people are doing the deep seat conversion!

 

John Roberts
 

 

-----Original Message-----
From: MarK Durham <62vair at gmail.com>
To: Frank DuVal <corvairduval at cox.net>
Cc: virtualvairs <virtualvairs at corvair.org>
Sent: Mon, Mar 24, 2014 7:37 pm
Subject: Re: <VV> 110 vs 140 Heads


Its just that the small valve heads have a lot less problem with dropped
seats than the hotter running 140 heads. I do not know the dynamics of why
that is other than the 140 heads have a larger intake runner and larger
valves and larger exhaust tubes so they can flow more air/fuel mixture and
produce more power and the result is its easier to put them over the edge
when less than ideal hot conditions exist.  Mark Durham Hauser Idaho
On Mar 24, 2014 3:07 PM, "corvairduval at cox.net" <corvairduval at cox.net>
wrote:

> I undrstand the flow of the 95 HP heads and better low end torque, but how
> does faster air fix the issue of valve seats falling out from cold air
> rushing through hot seats?
>
> Frank DuVal
>
>
>
> Original email:
> -----------------
> From: MarK Durham 62vair at gmail.com
> Date: Mon, 24 Mar 2014 14:06:04 -0700
> To: hmlinc at sbcglobal.net, virtualvairs at corvair.org, maxspeed at juno.com
> Subject: Re: <VV> 110 vs 140 Heads
>
>
> To avoid the valve seat issue, take a 95 head and add the 4x1 Clarks
> conversion. The smaller intake runners flow a faster air mix than the 140
> heads that gives better low end torque. Mark Durham Hauser Idaho.
> On Mar 24, 2014 1:46 PM, "J. R. Read" <hmlinc at sbcglobal.net> wrote:
>
> > "The Pros" will tell you to use 95hp heads on an A/C car.  Unless, of
> > course, if you really LIKE to replace valve seats frequently.
> > Later, JR
>
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