Hillsborough County schools get out May 25 for the summer break. ChaCha on! 7 years ago
Â· just now. Report Abuse. A cast iron manifold will expand and contract, the JB Weld will not. I think JB Weld is fantastic stuff (have some as we speak) but not for a cracked exhaust manifold.You can always check out their website: http://jbweld.net/index.php I only have experienced JB with cast though, if your manifold is another material you may get lucky.ource(s): Q: Will J-B Weld work on an automotive exhaust? A: Because of the extreme temperatures of exhaust systems, we do not recommend J-B Weld for use on exhaust manifolds and catalytic converters.
Two types of engines, two types of problems. This site contains links to information and hopefully some helpful explanations regarding head gasket problems with Subaru 2.5 liter normally aspirated (non turbo) engines. There are two types of engines, Phase 1 and Phase 2.G replacement instructions. Skip's writeup on a replacement of head gaskets. Includes a link to a guestbook where he invites you to sign up if you have experienced head gasket failure. This thorough writeup also has information on telltale signs of HG problems, and links to other good Subaru information.