[Fot] Fwd: TR3 Head

[DAVE HOGYE]

Hi Jeff,
TR3 and TR4 are basically the same, with slight and insignificant variations.  TR4A is slightly different and improved.  
TR4A has a horizontal/level flat with a number stamped just above the number 1 cylinder intake port. The number is 511695.  It's easy to see.  I think the latest TR4A heads also had aluminum push rod tubes.  So some TR4A heads had steel tubes and later got aluminum.  Other than that all 511695 stamped heads were the same.  
The earlier heads had 3/8" exhaust valve stems and 5/16" intakes.  TR4A had 5/16" stems on both intake and exhaust.  I believe the early heads used 3 springs on the exhaust valve as well.  
 
Best,
Dave H. 
 

> On 07/20/2026 10:41 AM PDT Jeff Snook <jeffsnook01 at gmail.com> wrote:
>  
>  
> Hi everyone,
> 
> Mike Moore has a few spare heads but isn't sure if they are from a TR3 or a TR4.
> 
> Can anyone help us describe how to differentiate a TR3 head from a TR4 head so we can see if one of his spares will work for our customer's car?
> 
> Thanks,
> 
> Jeff Snook
> 419-344-0319
> http://www.snooksdreamcars.com
> 
> 
> ---------- Forwarded message ---------
> From: Michael Moore <mmoore at mtmcpafirm.com mailto:mmoore at mtmcpafirm.com>
> Date: Mon, Jul 20, 2026 at 11:03 AM
> Subject: RE: [Fot] TR3 Head
> To: Jeff Snook <jeffsnook01 at gmail.com mailto:jeffsnook01 at gmail.com>
> 
> 
> 
> Jeff, any difference between a TR3 head and TR4 head?
> 
>  
> 
> I have a few spares but don’t what the engines came from.
> 
>  
> 
> Have a Good Day
> 
> Mike
> 
>  
> 
> Michael T. Moore, CPA
> 
> 3255 West 26th Street
> 
> Erie, PA 16506
> 
>  
> 
> Phone:  814-616-8652  ext 100
> 
> Fax:        888-865-5279
> 
> Email:    mmoore at mtmcpafirm.com mailto:mmoore at mtmcpafirm.com
> 
>  
> 
> This electronic mail message contains confidential and legally privileged information intended only for the use of the recipient. If the reader of this message is not the intended recipient, the reader is hereby notified that any dissemination, distribution, copying or other use of this message is strictly prohibited and is hereby instructed to notify the sender immediately by return email and destroy this copy of this message.
> 
>  
> 
>  
> 
>  
> 
> From: Fot <fot-bounces at autox.team.net mailto:fot-bounces at autox.team.net> On Behalf Of Jeff Snook
> Sent: Monday, July 20, 2026 10:27 AM
> To: Friends of Triumph <fot at autox.team.net mailto:fot at autox.team.net>
> Subject: [Fot] TR3 Head
> 
>  
> 
> Hey all, we are finishing up repairs/service to a 1959 TR3 for a customer, except it seems it is never ending!  The head was sent to the machine shop for a refresh and they determined it is cracked and not easily repairable.
> 
>  
> 
> So we are looking for a usable stock TR3 head.
> 
>  
> 
> If anyone has one, let me know.
> 
>  
> 
> Vroom, vroom,
> 
>  
> 
> Jeff Snook
> 
> 419-344-0319http://www.snooksdreamcars.com
> 
>  
> 
>  
>  
> --
> Jeff Snook
> 419-344-0319http://www.snooksdreamcars.com
>  
> _______________________________________________
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