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454 with cracked exhaust manifolds
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RX7
New User
Jul 30, 2010, 9:15 PM
Post #1 of 5
(3730 views)
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454 with cracked exhaust manifolds
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88 Chevy 1 ton, 2wd, 150k miles, with 454 engine has cracked exhaust manifolds. I am about to purchase this truck, cheap, knowing that there are several problems but none appear to be major. The one of most concern is the cracked manifolds. Is this a common problem and does it indicate another problem or is it just typical wear and tear. I don't know the history of the truck, but it appears to be farm use and doesn't show signs of abuse. Can the manifolds be repaired or is it best to replace with new, or headers?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 31, 2010, 5:36 AM
Post #2 of 5
(3725 views)
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Re: 454 with cracked exhaust manifolds
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They can be welded but it's usually just temporary and cracks again. Replacing the manifold is the best way to repair it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 31, 2010, 1:45 PM
Post #3 of 5
(3719 views)
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Re: 454 with cracked exhaust manifolds
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You know - I've run into several over MANY years on vehicles with no abuse and some never have a problem and are overworked so I plead IDK. Both on same engine is a first to me unless water was involved via cleaning (I don't like using water on an engine ever) or perhaps has been exposed to too deep of water while engine was fully hot.
Welding 'cast' metal just hasn't shown as strong as other type welding so I would replace vs that as Hammer suggested.
Start now with the penetrating oils as the bolts/nuts if used on anthing about taking them off will be a pill or worse,
T
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brokenwrench163
Novice
Jan 12, 2011, 11:56 AM
Post #4 of 5
(3612 views)
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Re: 454 with cracked exhaust manifolds
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yes 454 manifolds are a pain. welding with low heat with (nickel) rod will work, manifold should be machined off after, install 2 gasket of high grade (mr gasket ect) will prolong this problem longer. ( good luck)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 12, 2011, 12:20 PM
Post #5 of 5
(3608 views)
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Re: 454 with cracked exhaust manifolds
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This thread is 6 months old. Please look at the dates before posting.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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