[Fot] TR6 cylinderheads

[TeriAnn J. Wakeman]

Comparing the cylinderhead of this engine with another 6 cylinder head 
(probably also from a TR6 , but from a  Triumph saloon is also possible) 
: it turns out that my cylinderhead is lacking 5 coolant passages. My 
cylinderhead has only a passage just beneath outlet port no 6. The other 
cylinderhead has passages beneath every outlet port. I didn't know of 
this difference  between 6 cylinder heads.


Just a WAG. In the late 1960s and 1970s SMOG regulations were kicking 
in. One of the first things that manufacturers did was have their 
engines run hotter. Some manufacturers accomplished that by reducing 
coolant flow through cylinder heads, reducing passage size and/ or 
eliminating cooling passages. My WAG is that you have a late TR6 head 
intended for the US or just California market. I suggest going shopping 
for an earlier head that still has all the passages.

TeriAnn
Who knows nothing about TR6 heads