Installing an oversized exhaust valve seat into a 1950 Chris-Craft Model WBL

In this video we were asked to repair a previous repair of an exhaust valve seat coming out. I discovered that the block has been pinned twice prreviously. I found an exhaust seat that would work, had it cut to size by a local machine shop and installed it into the block while the boat was at it's dock. We used a 1950's Hall portable seat cutter and a Hall model EJ seat grinder to accomplish this task. Customer got the engine back together and took it for a sea trial and said it ran good.

[davidwiggins]

Any idea as to how long the previous repair lasted?