Lawrence Helfand Posted April 6, 2020 Share Posted April 6, 2020 Recently I noticed a little surface cracking in my 41 Century exhaust manifold and a tiny bit of soot telling me it went through and was leaking . I got some repair paste at the parts store but after application and a couple of heat cycles I could see the crack appear again in the hardened repair paste. I put some more on the crack but it soon reappeared. On a hunch I took a piece of fiberglass cloth and sliced up a pile of small bits of fiber and mixed it into the paste. I used a fair amount and after chipping off the old paste started anew. After a couple hundred miles and several heat cycles its still uncracked. Seems the fiberglass makes the patch less sensitive to expansion contraction cycles. Good luck all! 1 Link to comment Share on other sites More sharing options...
Matt Harwood Posted April 6, 2020 Share Posted April 6, 2020 Let's hope it holds! Hopefully repairing it will keep the crack from spreading. I'd almost advise that if you can see the crack, maybe drill a tiny hole at each end of it to prevent spreading. Anything you can do to keep that cast iron intact is time and money well spent. Link to comment Share on other sites More sharing options...
Lawrence Helfand Posted April 6, 2020 Author Share Posted April 6, 2020 Hi Matt, I hope your holding up under the pressure. I definitely am concerned about sales and values so you must be freaking out with your large investment and overhead. On a different topic I am in need of a pushrod for my 41 66s and so far have come up blank. I need a 13 7/16 length and all I am finding is much longer 13 3/4. Maybe you have some used? All the Best, Stay healthy ,Lawrence Link to comment Share on other sites More sharing options...
old car fan Posted April 6, 2020 Share Posted April 6, 2020 A good welding shop car do it.just had one repaired. Link to comment Share on other sites More sharing options...
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