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ID use of intake manifold opening

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First thanks for info given concerning heater disconnect.

I have a 1980 Coventry manufactured TR7 convertible with federal specification.

After replacing the water pump I noticed a circular 1 inch opening in the intake manifold in the general area of the large o-ring

on the bottom side of the manifold under the thermostat.  If you look through the hole you can see the thermostat.  In a Haynes TR-7 owners workshop

manual it is shown on page 52, center bottom pic.  What goes in this opening? a core plug?

Also I can not find a drawing showing there the bottom radiator hose attaches to the motor.  If this is where it goes there is no flange to

secure it to.

Thanks for helping another 7 return to driving condition.



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