Re: Question on head gasket and oil additive
The bore size on a new # 3995633 is 3.980. This gasket was used for the 307 motor,is steel shim & has a coating on it.
As far as I know G.M. has discontinued this gasket.
Not sure of the Fel Pro cross over #.
There are a couple of smaller bore gaskets G.M. # 14085906@ 3.875 & # 462690@ 3.875. They are both steel shim & have no coating on them.Also no longer available.
Just curious,what is the exact bore size of your motor?
Allan
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