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Unread 10-28-2013, 06:31 PM
Sam Green Sam Green is offline
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Join Date: Jan 2010
Posts: 701
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Sorry to contradict my learned friend Larry but the cover from the later model can't be used as the tach drive gearbox has the bearing for the camshaft built on to it. The camshaft runs in the gearbox, not in the head as it does in the later models.
Like Grubsie says, check that the oil return holes are both clear.
The only other reason for leaks (other than bad surfaces) is if a tach gearbox has been modified to work with a later head. This can be done but the later head still needs to have a hole drilled to allow the oil to return to the head.
If there is no oil return hole, pressure will build up in the gearbox and chances are, it will seep by the gasket.
Pictures of the inside of the tack gearbox and the mating surface of the head would help to determine if you have a modified tach cover on a late head, it can't be determined from the outside.

Sam.
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