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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#37506 02/10/2004 3:41 PM | Joined: May 2001 Posts: 1,907 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,907 | This is a very small hole like the one on the distributor side of the head that has the square-head plug in it. That one was drilled to provide an oil passage to the middle of the head and the oil connector. You can't even see it when the exhaust pipe is connected to the manifold. My throttle pivot is on a raised surface so it wasn't drilled all the way through.
Is there some kind of water passage on a 261 that was needed inside the block? Could this be related to the extra water holes between the block and the head of a 261?
I'm going to get a plug for it but it is smaller than 1/8" pipe thread which I tried last night.
Thanks!
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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