250 integral head - replace exhaust manifold?
Anybody ever replaced an exhaust manifold on an integral head straight 6? I haven't looked it over close yet but is this even possible? I understand the intake is cast in the head but the exhaust manifold is separate? Just want to eliminate the sound from the large hole until I get around to a V8 swap.
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Re: 250 integral head - replace exhaust manifold?
I think I figured it out from this thread:
http://67-72chevytrucks.com/vboard/s...d.php?t=563859 Yes. Anyone have horror stories tho? |
Re: 250 integral head - replace exhaust manifold?
When I disassembled mine for a rebuild, many (most) of the bolts that held the exhaust manifold in place snapped off. Since I was going to old style (non-integrated head) it didn't bother me as much. Not sure how you could pre lube/penetrating oil on them to lessen that chance. The last time I did one was 30 years ago and I remember the bolts breaking off that one also. That is the only issues I have seen with the exhaust manifold.
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Re: 250 integral head - replace exhaust manifold?
If you have room for an impact wrench in there that may help with the broken bolt threat.
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Re: 250 integral head - replace exhaust manifold?
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My engine is getting changed because of this. The bolt fragments are hard as rock from the heat cycling. I tried all the tricks to get them out. Considered changing the head to an old style, but 5.3 LS motor got chosen instead... |
Re: 250 integral head - replace exhaust manifold?
It appears the bolts are all threaded into the exhaust manifold which is junk anyway. If I break them all off I'm still okay as long as I can find a good exhaust manifold. No luck online yet. Otherwise yeah I guess it's LS swap.
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194/230/250/292 Exhaust Manifold
There are new ones out there, I think Summit Racing sells them, I searched and found them in Florida for $150 brandy new .
Cast iron, Chinese made I'm pretty sure . Used ones are out there, I have a few originals somewhere . |
Re: 194/230/250/292 Exhaust Manifold
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Re: 250 integral head - replace exhaust manifold?
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Boy did I get lucky! Found this truck in my local yard. Manifold looks good. Even has PS and PB. Wish me luck on the bolts.
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250 Integral Head - Replacement Exhaust Manifold
Sonofagun ~ you found it ! .
I hope you'll be able to disable the E.G.R. valve..... In case that one snaps too many studs / bolts, here's the link to new ones, I have NO REGRETS : https://www.google.com/search?client...haust+manifold |
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Re: 250 integral head - replace exhaust manifold?
Damn, sorry .
? Do you have the casting # off the old exhaust manifold ? . |
Re: 250 integral head - replace exhaust manifold?
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https://rover.ebay.com/rover/0/0/0?m...2F254193068579 |
250 integral head exhaust manifold
? That's your truck ? .
I like it ~ just what a light truck is supposed to be : simple and direct, ready for work . That used one will be a challenge to fix, getting the broken studs out is tricky for me . ? What happened to the one you showed in a junkyard ? . |
473369 exhaust manifold
It's been a while since I worked at a GM Dealer but they used to be able to do a nationwide computer parts search, now that you have the #, maybe go to your local GM (any GM Dealer can run GM part #'s regardless of brand) and find one languishing some where.....
I found more than a few parts fpr my old 1949 Chevy 3100this way . I'm searching but wow, this is a hard to find part . |
Re: 250 integral head - replace exhaust manifold?
Yes that's my truck. Yes the manifold is hard to find. That junkyard manifold is removed and at a local cast iron weld shop. It's all he does and he has white hair. It's not cracked, it is nice but he's removing 4 broken bolts. Didn't trust myself with it. See how lucky I was?
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Old Manifold Repair
Oh yes ! I know exactly how lucky you are I've been running InLine 6 bangers since the 1960's and love them and know the difficulties .
When your truck was new I did parts support for them in a Municipal fleet, they were fantastic rigs *but* had serious casting flaws in the cylinder heads and few made it past 20,000 miles before cracking irreparably, at one point I had about 30 of them lined up waiting for GM to release the new, revised and crack resistant cylinder head, over 12 months waiting, at that time you could by a two year old 1/2 ton pickup for maybe $1,200 with a bad head and no replacement in sight . We held on to ours and repaired everyone, they were all still running like new (with revised cylinder heads) when we salvaged them years later . Once you get this sorted out you're going to love this truck . |
Re: 250 integral head - replace exhaust manifold?
That's quite a story VW. Thanks for sharing that with us. Hopefully my motor has one of the new and improved heads and I'm not wasting my time with this exhaust manifold.
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i6 Engine Repair
Any older Journeyman Mechanic has more stories than they can remember .
I'm luckier than you as I grew up working with and on, pre WWII ~ early 1960's vehicles and as farm vehicles most were i6 powered . I could care less about spinning the tires, I drive my jalopies 800 + miles every seven days and all are 'junk' . GM knew _exactly_ what they were doing when they designed and released the '73 ~ '87 'Square Bodied' trucks ~ the bodies were cheap tin foil but the rest of the rigs were still packed with good engineering , cheap to purchase and operate,cheaper yet to repair . |
Re: 250 integral head - replace exhaust manifold?
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I was successful! Manifold is in and it purrs like a kitten. Old one was broken completely in half.
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Re: 250 integral head - replace exhaust manifold?
Good to hear! :metal:
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Re: 250 integral head exhaust manifold?
Whew, that old one looks bad .
Question ? . Do the outer ends of the exhaust manifold have pins, studs and nuts or bolts ? . I ask because on the previous engines many replace the outer pins with bolts or studs & nuts and so force the manifolds to crack . |
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