[Healeys] 100-4 engine head gasket?

[Alan Seigrist]

All -

My A90 just started running weird.  So I took a compression tester and I'm
getting (note the A90 is lower compression than the 100):

1 - 135 psi
2 - 135 psi
3 - 60 psi
4 - 60 psi

When I put the compression tester on number 3, I get blow back through #4
spark plug port.  Then when I put it on #4 I get blow back through the #3
spark plug port.

Seems to me it's just a blown head gasket.... am I correct?  as far as I'm
aware, these heads usually crack between 2 & 3, correct?

TIA

Alan
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