[Healeys] 100-4 engine head gasket?

[Michael Oritt]

Probably blown gasket at the 3-4 bridge.  My original head suffered from
erosion of the metal at the 1-2 bridge, allowing the gasket to blow.  I had
it built up enough to work for a while but eventually replaced the head
with a DWR AL model.

Best--Michael Oritt

On Mon, Jan 25, 2021 at 4:55 AM Alan Seigrist <healey.nut at gmail.com> wrote:

> 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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