C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Cracked LT1 manifolds (exhaust)

 
Old 04-15-2019, 06:45 PM
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anesthes
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Default Cracked LT1 manifolds (exhaust)

Check under the heat shields. It seems they all crack just like this. Notice the carbon staining on the inside of the heat shield. These were ticking for a while.


-- Joe








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Old 04-15-2019, 07:19 PM
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don hall
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May help (?): https://itstillruns.com/weld-cracked...d-5642735.html

Had a manifold welded successfully on one of my fish boats. I know, it wasn't a vette, but it was done by a
knowledgable welder..Just had to bring the cast iron up to temp.

Last edited by don hall; 04-15-2019 at 07:21 PM.
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Old 04-15-2019, 09:29 PM
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81c3
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Perfect time to replace them with headers and a nice full exhaust system. Lighter, better looking , sounding and most of all more HP..!!

Last edited by 81c3; 04-16-2019 at 11:05 AM.
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Old 04-15-2019, 11:31 PM
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mtwoolford
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Welding cast iron is a real crap shoot. I have had good luck grinding away the crack and using a gas torch and brazing the affected area. But the long term solution is probably going to be a new manifold(s)
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Old 04-16-2019, 12:47 AM
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I've welded plenty of cast turbo manifolds, but I won't bother fixing these.

I just wanted to show members to check your manifolds when out of the car
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