[6pack] 6pack Digest, Vol 3, Issue 60

[peterschop at aol.com]

I just looked at my head and it has a bold N with a 2 above it. You learn something every day.

Peter Schoppelry
'69 TR6









On Mon, 16 Feb 2009 peterschop at aol.com wrote:

> OK, what is a Circle B head?


There were a number of foundries that cast heads for Triumph. The 
foundries all used a different casting mark (usually on the front of the 
head on the manifold side but under the valve cover).

Circle B is a scrolly-looking B (like the B in Bentley) inside a circle.

There are others, Block N is one.

The Circle B heads were sought after by racers as the castings are 
reportedly thicker than the others, hence they make a better candidate for 
porting and milling (e.g. you can take more material away without 
compromising the head.

Regards,
rml
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