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estout81 · 11-02-2019, 07:29 PM

Here's what I did. Used Autolite 4092 plugs and chamfered holes on combustion side to cut out exposed threads. The heads are Offy. 400. Don't know the age of the heads as they were on the engine when I got it. I tried the Autolite 437 but, the valve hit the ground electrode. Don't know anything about the cam except that it had about .330+ lift. After doing this, plus fixing many other problems with this engine, it now runs fine.

11-02-2019, 07:29 PM	#15
estout81 BANNED Join Date: Jun 2010 Location: Utica, Ohio Posts: 522	Re: Spark Plug Protrusion into Head? Here's what I did. Used Autolite 4092 plugs and chamfered holes on combustion side to cut out exposed threads. The heads are Offy. 400. Don't know the age of the heads as they were on the engine when I got it. I tried the Autolite 437 but, the valve hit the ground electrode. Don't know anything about the cam except that it had about .330+ lift. After doing this, plus fixing many other problems with this engine, it now runs fine.