"TR" head bolts

[GaryL]

Where we these used other than the thermostat housing?

[BlackoutSteve]

Intake manifold and water pump as far as I know.

[GaryL]

The intake is "M". The water pump bolts are "TR". How about the alternator bracket (3 total) to water pump?

[nuch_ss396]

TR head markings were used in a number of locations including accessory mounting and manual transmissions ( mounting to bell housing, side cover ).

Steve

[68rsssrag]

Also on rear drum brake backing plate to axle carrier.

Arno