[Fot] TR4 head milling

[Ken Knight]

I would agree with Tony.  Given that you never know if the casting of your head is thin at some location it is better to start on the conservative side.  Better to leave a little power for next time than ruin a head you have lots of work in.  I say this because there is far more power in the valves and porting than a .010 cut off the head for more compression.  Ken

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From: Tony Drews via Fot
Sent: Saturday, April 6, 2024 1:50 PM
To: GREGORY THOMPSON; FOT Triumph
Subject: Re: [Fot] TR4 head milling

Working with my dad (uncle jack) we considered 0.130 to 0.150 "normal" to mill, 0.190 to be where it started to get dangerous.  That said, there is some variability from head to head on where the internal water passages are.
Regards, Tony
On 4/5/2024 6:27 AM, GREGORY THOMPSON via Fot wrote:
Has anyone had an issue with breaking into a water jacket on the TR4A head with taking off .150? 

Thank you,

Greg Thompson 


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