Originally Posted by kwilford
Are you certain that this particular plug is aluminum? I know that the cam bearing oiler holes are plugged with aluminum plugs, but I think that this plug looks like steel.
Has anyone ever removed this particular plug. On my CIH's, I had all the aluminum plugs drilled out and the holes tapped for threaded plugs, but this one is still "as is"
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I remove them on every head I build. Access to clean the oil feed passage to the head.
I then tap them oversize to 1/8" NPT, and put in a pipe plug. The plug must be
below the surface of the intake face, as some exhaust manifolds will overlap the plug and having a plug 'proud' of the surface means the exhaust will then leak...
In
this pic, you can see the plug has been removed.
HTH,
Bob