Glenn
The 516323 is an Engineering reference # and first appeared on the TR250.
for your info, other factory data I have relevant to this head (when new)
was:
Head height (nominal) 3.535 inches
Piston type: Flat
Exhaust valve dia: 32.0mm
Pushrod length: 8 and 5/16ths inches. Apart from the squared EGR hump, its
the same as the later TR6 carb head whose Engng ref no was 218227
Jonmac
I am attempting a roller rocker upgrade on my '70 TR6, but have run into a
problem with the standard (solid) pushrods either slightly touching or
coming
too close to the head at the pushrod journals. The spec for the rockers
indicates the distance from the pushrods to the journal walls should be
.030".
As far as I know the engine is stock and the 1:1.75 ratio roller rockers
should work. The engine number is CC52689E, which according to the TRF
catalog and my British Motor Industry Heritage Trust Certificate is correct
for my car. I know the engine has been rebuilt. The head has multiple
stampings and casting identifications and I don't know what they mean, and
is
the head "correct" for the engine.
The following list is the information cast/stamped on the head:
- - Front of head by thermostat housing, stamping on valve cover gasket
surface
- - JJ
- - manifold side of head, cylinder #1, stamping on valve cover gasket
surface -
516323 (I couldn't find this number in any parts catalog)
- - manifold side of head, cylinder #3, casting number - Z(?)307837
- - manifold side of head, cylinder #4, casting number - B110
- - manifold side of head, cylinder #5, stamping on valve cover gasket
surface -
20
- - manifold side of head, by heater valve, casting number 130691(?)
I measured the thickness of the head and it is 3.4585" which is very close
to
the 3.460" for the 8.5 CR head used on the '70 TR6.
The rocker pedestals are Stanpart 145867 (#1), 144974 (#2-#5) and 145869
(#6).
I know this question is asking a lot, but I don't want to give up on the
roller rockers.
Thanks,
Glenn Rierson
'70 TR6
Jonmac
"In the Shadow of my Father" aka "Life at Triumph"
Still a few copies left. Still time to catch the Christmas mail
http://www.toolbox.ndirect.co.uk/triumphbook
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