Chachos 49 Posted June 1, 2021 Report Share Posted June 1, 2021 Hey y’all, I have a 1950 Plymouth it’s got a crack on the block about 8 inches horizontally right below the head where the coolant flows through. I’ve heard old tales of people who have used jb weld or something of that sort to seal it. Some like it and it works for many years others don’t like it. I really don’t want to spend the money on getting a new block and a rebuild. I would like to know your thoughts on it! Good or bad, I would especially like to hear from you that have actually done it and your experience with it. Thank you Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 1, 2021 Report Share Posted June 1, 2021 JB will not stop that crack from leaking. You can try magic sealers but after awhile they will leak. A common cause of a crack close to the head deck area is tightening head bolts or studs to tight... That crack will move during hot and cold cycles....sealant won't work well. To do it right so it will not leak..... Lock and Stitch Block Repair or a system similar. Quote Link to comment Share on other sites More sharing options...
Chachos 49 Posted June 1, 2021 Author Report Share Posted June 1, 2021 What do you mean by lock and stictch block repair? Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 1, 2021 Report Share Posted June 1, 2021 http://www.locknstitch.com/index.html Not cheap! 1 Quote Link to comment Share on other sites More sharing options...
RobertKB Posted June 1, 2021 Report Share Posted June 1, 2021 I would look for a decent used engine. It will be cheaper than a rebuild or lock and stitch repair. 1 Quote Link to comment Share on other sites More sharing options...
Sniper Posted June 1, 2021 Report Share Posted June 1, 2021 Lock and stitch isn't expensive if you do it the old fashioned way, I'll see if I can find a video Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted June 1, 2021 Report Share Posted June 1, 2021 you talking of the drill and tap insert screw method?.....then grid down to make it look purdy... Quote Link to comment Share on other sites More sharing options...
chrysler1941 Posted June 1, 2021 Report Share Posted June 1, 2021 (edited) That's a serious crack. Why didn't plug pop? There may be more internal cracks. You now have a MoPar coffee table stand Edited June 1, 2021 by chrysler1941 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted June 1, 2021 Report Share Posted June 1, 2021 actually it appears to me the plug on the lower right of the picture did pop at an angle as it is showing above the lip of the machined block boss...and again, could just be an illusion as photographed... Quote Link to comment Share on other sites More sharing options...
Chachos 49 Posted June 1, 2021 Author Report Share Posted June 1, 2021 I think I found my video Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted June 1, 2021 Report Share Posted June 1, 2021 I did a 35 Airflow that was cracked in the exact same spot below the deck with Belzona $$...after a month it was leaking again. The engine shown above really should be replaced IMO. Lock and Stitch is a special type of locking thread( requires their own tooling drills and taps) system that pulls the two sides of the crack together. The old style tapered threaded stitch pins put some force on the repaired crack. 1 Quote Link to comment Share on other sites More sharing options...
Booger Posted June 1, 2021 Report Share Posted June 1, 2021 sorry about your misfortune but that picture has a abstract painting look, Picasso like insure for $20k 1 Quote Link to comment Share on other sites More sharing options...
wagoneer Posted June 1, 2021 Report Share Posted June 1, 2021 (edited) You may spend a lot more than $500 and a lot of hours fixing your original block with only more leaks to show.. Based on other posts, and those online, you should be able to get a new block relatively inexpensively. This 1950 dodge block from Frenchlake auto is 150 + 375 in freight shipping -- https://www.ebay.com/itm/143965097540?hash=item2184fd0e44:g:xMsAAOSwagpgPV-Y That dodge block should drop right into the Plymouth spot... after a bit of cleanup and its own TLC. Edited June 1, 2021 by wagoneer Quote Link to comment Share on other sites More sharing options...
Booger Posted June 1, 2021 Report Share Posted June 1, 2021 Im not to far from French Lake I can do a visual theres more than one out there Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted June 2, 2021 Report Share Posted June 2, 2021 Lock and Stitch was used to repair the dome of the US capitol building. (Trivia: The city is Capital; the hill, building and its dome are Capitol, after the Capitoline hill in Rome.) 1 Quote Link to comment Share on other sites More sharing options...
knuckleharley Posted June 4, 2021 Report Share Posted June 4, 2021 Judging from what LOOKS like freeze plugs being pushed out of the block by rusty water pressure,I would say that crack is not your only problem. Yes,you CAN fix one by welding it up if you or whoever you turn it over to knows what they are doing,but given what looks like all the rust inside that engine,I would just be looking for another block. Try to find one with the same bore and stroke as the one you have now so maybe you can reuse some of the parts in the future. Yeah,so I'm cheap. Sue me! I know if it were ME,I wouldn't think about doing anything to that engine but pulling it out and using it for parts. I hate the idea of having to do the same work twice. 1 Quote Link to comment Share on other sites More sharing options...
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