[Fot] Head Thickness

[fubog1]

I have the TR-3/4, and 1300 Spit heads sectioned, but not the 6 cylinder or late Spit, which are different, so I'm no help here, but I will say though that it's just a rough casting, and the squish area "flat" is where it will first go through. This is likely where Scotts machinist is seeing it start to "sink" in a bit.
Glen

 

 

-----Original Message-----
From: SCOTT JANZEN via Fot <fot at autox.team.net>
To: damys <damys at charter.net>; 'Friends of Triumph' Triumph <fot at autox.team.net>
Sent: Mon, Apr 6, 2015 8:47 am
Subject: Re: [Fot] Head Thickness


 
I will measure two of mine when I get home . There's no single answer as every casting is different. I've got one at 12:1 compression with no thin spots and another at 11.5:1 where you can clearly see a thin spot where the metal is deforming near a cooling passage. The machinist did several light passes, looking for this. 
 
There was an email just over a week ago with photos of a head marked with the thin spots. Look for that for guidance and find a good machinist that will take a little off at a time, looking for trouble.  
  
Sent from my mobile device  
 
  
On Apr 6, 2015, at 7:27 AM, damys--- via Fot <  fot at autox.team.net> wrote:  
  
 
 
  
   
    Wondering if anyone can tell me the max I can shave off my GT6 head. Actually looking for the minimum height of the head after milling.  Right now the head stands at 3.283".  With a 2.95 bore, 2.99 stroke, .033 squished head gasket and 34.5 cc valve pockets.  The compression, as I figure it, is 9.76:1.  I'm looking for 12:1.   
   
    The head is stamped V3119 and 308361.   It's off of a 1970 GT6+ that we're building strictly for racing.  Looks like we can still remove at least .040.   
   
    Any help will be greatly appreciated.   
   
   
    Dave   
  
 
 
  
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