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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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| | | | Joined: Aug 2016 Posts: 121 'Bolter | | 'Bolter Joined: Aug 2016 Posts: 121 | What is the size and thread pattern of the block petcock for a 235. Mine has a pipe plug and I want to make it stock. Also, when I remove the plug nothing comes out of the block because it is stopped up. What is the safest way to unstop and not do any damage. Thanks, ray durham [email protected] | | | | | Joined: Jan 2014 Posts: 3,689 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,689 | It’s 1/8 NPT.
You are fine to get things moving with a coat hanger wire or similar. Shooting some compressed air helps.
Probably good to do a thorough chemical flush while you’re at it.
1951 3100
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It is 1/4 in pipe thread.
JW is right about poking a wire or long screw driver in the hole. If its just a little scum on the surface it will drain right out. It could be a whole lot of crude. It so it will need to be flushed out.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2004 Posts: 29,814 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,814 | Screw a quick connect air line fitting into the block (it's the right thread) and hook up your air compressor to the fitting. Be sure to take the radiator cap off before you turn the air pressure on. You'll clear the clog, and back flush the radiator at the same time.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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