Every OMC service manual I’ve ever read says that all new engine gaskets should be coated with a gasket sealer (including the head gasket in some manuals). I may not have a big reference base since my outboard collection is very small, but every mid to late 50’s OMC motor I’ve opened up apparently never had any type of gasket sealer – every gasket has easily come out in one piece with zero trace of sealer residue on either the gasket itself or the gasket mating surfaces. Most of those original gaskets were in very good condition and could likely be re-installed on the motor. So what type of sealer was originally used during factory assembly or did OMC use some type of original gasket material that did not require a sealer? In the process of a full mechanical restoration I always install new gaskets and apply sealer to them, so was curious if some different process was used at the time of original assembly.