ID of 2 piece head on chevy 250 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-08-2009, 08:54 PM
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ID of 2 piece head on chevy 250

I have a '77 c10, with an original 250 I6, with 54,000 miles, I want to eliminate the integrated intake and exhaust head. I was told there was one kind of head that you can do this, and one kind you can't, the simple way for me to do this I think is just to put a set of headers on the engine, with going for the complication of changing the intake. is there way to do this?

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Old 03-08-2009, 09:35 PM
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integral 250 head swap.

Just find ANY 194, 215, 230, 250, 292 style engine, and get the complete head, intake, and exhaust manifolds, along with the carb, aircleaner, valve covers, and all the fasteners. It will all fit on your 250 short block, and in some cases, give a boost to the compression ratio.
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Old 03-09-2009, 01:08 AM
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yep! just take a non integreal head and manifolds from a donor engine and put them all on your integreated head engine

easy.

exhaust pipe will need replaced with single non integrated one

other things in the will need changed too, with older parts, linkage parts, brackets etc.

but east to do on the L-6 engines

usually 77 were still red colored and were non integrated

i know they were in the 77 cars anyways such as the '77 nova 250 2 door i had, and the '74 ventura 4 door i had also.

78-up blue color however.

i remember integrated 250 not happening until 83 or so and ive only seen one actually in an 80 something pickup


not many survived

haha




good luck



good luck
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Old 03-09-2009, 09:02 AM
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well, I think I asked the wrong question, heheh,
How can I tell if its integrated or not? the color of course is gone. so I have no way to tell the color.
I might need to post a pic on here for better clarification
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Old 03-09-2009, 09:07 AM
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Quote:
Originally Posted by 77chevyc10
well, I think I asked the wrong question, heheh,
How can I tell if its integrated or not? the color of course is gone. so I have no way to tell the color.
I might need to post a pic on here for better clarification
The intake will be a continuously casted part with the head, like the old Ford Falcon engine rather than a seperate bolt on part.

Bogie
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Old 03-09-2009, 09:37 AM
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ah ok, that is what it looks like, accept there appears to be a place they can be seperated it looks like some kind of bolt/flange. also, would the head itself have to be changed if I went with the change over?
my goal is to take the exhaust manifold off, cap off the intake and run a header on it. I don't want to change out the intake right now if I don't have to. the reason is, I want to put a new exhaust system on it. and I want of course to put a header on it and I want to do this all at the same time.
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Old 03-09-2009, 09:59 AM
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As bogie said, the integral head has the entire intake and a portion of the exhaust cast into the head, and is one continuous casting all in one. No one makes a header for the integral head or an intake either, since the originals cannot be removed, and the portion that does attach to the exhaust, will not interchange with an earlier non-integral head swap. The integral head is very notorious for cracking, and if you decide to keep it, it should be magnafluxed and inspected thoroughly before reusing. The best alternative is to swap for an earlier non-integral head, as already mentioned, so you can have the advantage of a removeable intake manifold and a bolt-on header, plus having a better cylinder that will boost compression a little....
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Old 03-09-2009, 01:32 PM
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ok, I was being a little stoopid ehehe, I understand now that the head and the intake are one piece. not neccessarily the intake and the exhaust.
now all this makes more sense.

Thanks
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Old 03-09-2009, 06:37 PM
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Boat engines used the non integral heads, they had to use a separate intake exhaust manifold to flow water through. I had a boat with a mid 70's 250 in line six that had a non integral head. The only problem with using boat engine parts is salt water eats them inside out. Fresh water engines are not as bad since they have fresh water being pumped through them constantly, and are drained in the winter. This is only on open cooling systems, closed systems would be no worse than car engines. Try looking at old boats if you can't find a non integral head in a car or truck.
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Old 03-09-2009, 07:41 PM
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The integral head uses a different exhaust system that doesn't match up to the regular 194-292 head and only Hooker made headers for this engine and only for a short time. For any type of performance upgrades one of the first changes should be the head. The 194 has a smaller combustion chamber and will up the compression ratio a little. After changing the head you can choose from several intake and exhaust options. you might want to go to www.inliners.org and search around the threads there to get a better handle on the parts swaps and available speed equipment.
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Old 03-10-2009, 03:04 AM
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The integral intake started in '75. Anything newer with a separate intake has already been converted.
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Old 05-08-2009, 08:37 AM
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250 straight six.

Don't know if you found your non-integrated head or not, but if you did, I happen to have (new in box) a four barrel intake manifold for the non integral 6 and also (nib) a dual exhaust manifold for it. My project fell thru and these parts are no longer needed..................T
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