To help get a visual on the reasons for removing the spark plug gaskets on I believe it was the 63 and up drool tube heads, I went out and took a few pictures. And of course, everything @slantsixdan posted with his generously provided service bulletins was right on the mark, as usual.
First, here is the counterbore that the plug tubes fit into.
Next, you can plainly see the tube end tapers into the perfect diameter to fit into the counterbore in the cylinder head.
Finally, here is the difference between a plug without the gasket (nearest) and one with the gasket (next one down). It actually ends up being a bigger difference than you might expect. Certainly enough to effect the heat dissipation the Chrysler technical bulletin was speaking of. I think this alone is reason enough to say with concrete evidence that removing the gaskets on the drool tube heads with the counterbore is the correct thing to do. As always, thanks @slantsixdan for your expertise in this area. I just wanted to follow up with pictures so all of you could have a good visual of the situation. The last thing we want is for members falling for erroneous information, posted with no basis in reality.
First, here is the counterbore that the plug tubes fit into.
Next, you can plainly see the tube end tapers into the perfect diameter to fit into the counterbore in the cylinder head.
Finally, here is the difference between a plug without the gasket (nearest) and one with the gasket (next one down). It actually ends up being a bigger difference than you might expect. Certainly enough to effect the heat dissipation the Chrysler technical bulletin was speaking of. I think this alone is reason enough to say with concrete evidence that removing the gaskets on the drool tube heads with the counterbore is the correct thing to do. As always, thanks @slantsixdan for your expertise in this area. I just wanted to follow up with pictures so all of you could have a good visual of the situation. The last thing we want is for members falling for erroneous information, posted with no basis in reality.
