Some people say the Atomic Four takes 2 head gaskets, and some say it only takes 1. Who is right?
Both are right. 2 head gaskets (Universal #23776) were specified for the Atomic Four from its introduction until Westerbeke released a new graphite gasket (Westerbeke/Universal #200452) in 1996. The technical bulletin released with the new gasket specified only 1 of the new gaskets is required, however the manufacturer of the gaskets, Victor Gasket, specifies that 2 gaskets are to be used, as do several American Atomic Four specialists (ie Don Moyer). Our tests suggest that 1 gasket works fine, however 2 gaskets probably work well when the cylinder head gasket surface has been machined several times because using 2 gaskets helps lower the compression ratio slightly, which is a good thing in flathead marine engines like the Atomic Four. Refer to Universal Service Bulletin 223 for more information.
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