[Fot] TR6 Aluminum Heads & special TR-4 heads

[Greg Solow]

I recently acquired what I believe to be one of the 13 heads that Kas told 
me he had made. At first I noticed that the part  number, 511695 that is 
stamped into the head above the #1 inlet port was upside down and in smaller 
numbers than any of the other TR heads that I have ever seen. I then noticed 
some differences in the casting. After some measurement, we found that with 
.200" milled off of the head, the bottom deck is still over .200" thick and 
the edge of the shelf of the head under the spark plugs is thick and not 
sharp as a normal head with .200" off would be. When I received this head, 
with a bunch of other parts, it have racing springs and alloy retainers on 
it and had been ported and polished. There was some damage to the "squish 
area" of  two of the chambers from broken rings or other debris getting 
crushed between the piston crown and the head. Fortunately, the head is 
still thick enough that it can be milled to clean it up and it will still be 
thick enough to hold a gasket!
    Teriann Wakeman has been down to take some pictures of the head. She may 
post them to her web site if people are interested.
                                                                             
                    Greg Solow
----- Original Message ----- 
From: <BillDentin at aol.com>
To: <rjl6n at cstone.net>
Cc: <fot at autox.team.net>
Sent: Tuesday, April 20, 2010 12:05 PM
Subject: Re: [Fot] TR6 Aluminum Heads


> In a message dated 04/20/2010 12:07:37 PM Central Daylight Time,
> rjl6n at cstone.net writes:
>
>> The serious engine builders like them because it is
>> a lot easier to grind the chambers to improve the
>> flow.
>>
> I'm sure that's so, but it can bite you in the foot too.  The head I have 
> I
> bought from Darryl Uprichards (sp?) in the UK many years ago when someone
> had made a couple dozen (a guess).  Darryl had two left when I ordered 
> mine,
> and he ruined one of them prepping mine.  I believe him because he shipped
> me a piece of the ruined one along with the good one.  That 'woops' had to 
> be
> a bitter pill for Darryl at the time as they were rare.  Subsequently
> someone made a whole bunch of them.
>
> Someone told me that in the glory days, there were a limited number of
> special TRIUMPH heads cast with a thicker base, lending itself to shaving
> options.  Maybe that's sour grapes by people who got passed.  I've never 
> seen one.
> If that's a true story, I have to assume KAS has seen them...and up close.
>
> Bill Dentinger
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