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Mod | | | Forums66 Topics128,021 Posts1,055,352 Members48,420 | | Most Online14,466
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: Apr 2011 Posts: 96 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2011 Posts: 96 | I have a 216 in my 46 2 ton that is seized and a 235 in pretty good condition also seized, what is the best thing to use to unfreeze the piston.
Also the 235 was rebuilt, the guy that gave it to me told me it was newly rebuilt but has been sitting so it needed work, when I torn into it all the parts are new and the 030 stamp is perfect on the piston and the rocker arm still has identification paint on it, but the problem is the block was cracked and re-welded, was this common? Can a block be repaired correctly or was the person putting new parts in a worthless block? I was just trying to figure out why? And would like to know if its safe?
Thank you for any help,
Josh
| | | | | Joined: Jan 2008 Posts: 4,960 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,960 | What was done many years ago is not necessarily the best route to go today. Years ago parts were expensive and labor was cheap. Lots of blocks were welded and they ran for a while. In today's times, I would never throw money into a welded block today. However I did have some welded blocks almost 50 years ago because that was the cheapest way to get up and running back then. | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | I prefer Kroil to unstick engines with rings frozen to the cylinder walls, etc. www.kanolabs.comKroil won't repair rust pits, but it penetrates better than any other oil such as WD-40, PB Blaster, etc. Once you get the engine turning, you can do a good inspection of the cylinder walls for any possible serious rust damage. If the block is welded on the outside, no big problem, even if there's a little weld porosity that causes a coolant seep leak. Use Marine-Tex sealer to cover the weld and stop the leak, after grinding the surface around the weld smooth for an inch or more in all directions. Internal welds that might allow coolant to get into the crankcase- - - -sort of risky to try to use those blocks! Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Apr 2011 Posts: 174 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2011 Posts: 174 | diesel fuel works amazing, i put it in my cylinders, let it sit for a week and a half and now it's actually running  it also eats away any rust that might be on the inside
Last edited by Josh_51GMC; 07/02/2011 5:10 AM.
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