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YZ250 copper crush washers on head but not the base studs?

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On the YZ250 and I guess most other 2 strokes:

Why are there copper crush washers under the nuts on the head studs, but not on the cylinder base studs?

I guess it's to reduce the chance of coolant leaking past the head studs.

Thanks.

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the base gasket seals the bottom, but the studs are exposed to the water jacket and need to be sealed externally.  If you had a head gasket rather than o rings, then you would not need copper sealing rings on the head.

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