Quote:
Originally Posted by BRENT in 10-uh-C
Bob, this is kind of a two-edged sword. Most original manifolds have been re-surfaced where some, -if not most of the recess is missing. At that point, trying to use gland rings is moot. For the home machinist with a mill, the counterbore is re-added with a boring bar.
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In their
instructions for their manifolds, Bratton's says to check the counterbore on the manifold and the block. You want to make sure the combined depth is sufficient for the gland rings to fit without creating a gap between the two pieces. Not only will it cause leaks, but the manifold ears may break when torqued down.
Now, they recommend filing down the gland rings to fit – I assume because most of their customers don't have a mill. Not sure what the effect of that is compared to deepening the manifold counterbore as Brent suggests.