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Old December 30th, 2018, 06:54 AM
WE7X WE7X is offline
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Join Date: Sep 2013
Location: Issaquah, Washington
Truck: 1970 GMC RM-7500 based Motorhome
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Default Re: A drilled hole in the side of the block.

That looks like it would be in the water jacket, but the hole looks like it is in a factory cast boss.
I do not have a block to look at, but is that a hole for the block drain plug? Is there a similar one on the other side of the block?
Rod Johnson
Issaquah, WA.
1970 RM-7500 'Motor Home'

Last edited by WE7X; December 30th, 2018 at 06:56 AM. Reason: typo
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