<VV> The Cromwell Method?

[RoboMan91324@aol.com]

OK Gang,

As usual, I have lagged behind on my digests, so this may have been asked and 
answered but here goes ........  What exactly is the "Cromwell Method" of 
retaining valve seats?  Where can I get detailed info on how to do it?  Most 
important; is this a proven method like the deep seat method or is it just that 
nobody has experienced a failure with the Cromwell method YET?  It was said that 
it is reliable for someone on a budget.  I am not sure what that means.  Does 
it fail for people who aren't on a budget?  How does it know if you are on a 
budget or not?  (gggggggg)

Cheap and easy is a good thing if it works.
Doc
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Message: 7
> Date: Tue, 20 Apr 2004 23:43:20 -0700
> To: <virtualvairs@corvair.org>
> From: Tony <tonyu@roava.net>
> Subject: Re: <VV> Re: valve seat set screw retention/tap sizes
> 
> At 1049 04/20/2004 -0400, Bruce Schug wrote:
> >
> >This thread has turned into a somewhat interesting thread on threads (?). 
> But, I have to ask, is this a viable way to get reliable valve seats in a 
> Corvair? 
> 
> Well, for the folks on a budget who don't mind the DIYS methods, yes it is.  
>  
> 
> >I've heard it mentioned from time-to-time but I continue to hear that the 
> best way to solve this problem is to:
> >
> >1. Heat the whole head to remove stress (I think that's what it does)
> >2. Remove all the old seats
> >3. Machine the head for DEEPER seats
> >4 Heat the head and install the new deep seats with a significant 
> interference fit.
> 
> Nice fix, good for the duration, never have to worry much about a seat 
> coming
> out again.  But...   
> 
> How much dos this cost today?   
> 
> 
> >I will add that Bob Coffin installed bullit-proof seats in my heads in 1986 
> when he was still in Mass. I have never had a problem with them through all 
> kinds of driving conditions: rallys, autocrosses, VIR in 90+ degree heat, 
> economy runs, street driving with the air-conditioning on, etc. Why try to 
> invent the wheel, this wheel works fine for me!
> 
> I don't think anyone was trying to reinvent the wheel, just trying to keep 
> the existing wheel rolling without going broke.   
> 
> I've done the Cromwell setscrew trick and it works... and it cost me about 
> 15 bucks for the hardware to do 4 heads.   Make sure the guides are OK and the 
> seats will stay put.   So far, so good.   
> 
> tony..