226 H Series Flathead plug hole identification.

[41Joe]

I need to know what these holes go to on the drivers side of the block. They all look to be 3/8 NPT. I know one is for the oil pressure and one had a drain petcock in it. Not sure about the others. Any body have any suggestions as to what actually needs to be plugged and what doesn't? The holes in question are circled in red.

 

[Bob C]

From the front. Pipe plug, oil pressure, block drain valve, pipe plug.

Bob

 

[Russ/40]

Not familiar with the 6 cylinder, but im betting three of those holes are dead ends and are for external mounting purposes.

Yup, 40 Deluxe, I overlooked the obvious - 3/8NPT

 

[40 Deluxe]

Not familiar with the 6 cylinder, but im betting three of those holes are dead ends and are for external mounting purposes.

Not when they're pipe thread (NPT)!

 

[41Joe]

From the front. Pipe plug, oil pressure, block drain valve, pipe plug.

Bob

Thanks Bob. That's what I needed.