I agree the thermostat housing and fuel pump are odd. I have an oil fill
cap just like that on my relatively original TR4A. From the looks of the
intake manifold and SU carbs, I would place it as an mid to late vintage
TR4A engine. Everything else looks correct for a TR4A. It would seem that
the thermostat housing would cause hood clearance problems in a TR4A.
It looks the PCV valve is missing and the valve cover vent is plumbed
straight to the manifold. That would likely cause some interesting problems
with oil consumption and low vacuum unless there's some sort of PCV valve or
flow restrictor in the hose that I can't see.
Ben Zwissler
bzwissler1@insightbb.com
Columbus, IN
66 TR4A IRS OD
80 TR8
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