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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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#37503 02/10/2004 3:50 AM | Joined: May 2001 Posts: 1,907 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,907 | I was filling the cooling system of my rebuilt 261 tonight when the coolant started flowing out a small hole in the block just behind the exhaust pipe flange.
It's too dark and cold on the driveway to investigate further tonight but what the heck is that hole doing there? A block petcock is at the rear of the block and low for good drainage. I'm going to put a threaded plug in there tomorrow but what's the purpose of that hole?
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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