exhaust manifold interchange

[kljfamily]

Hello group!

65 c10 stepside
installed a motor I found off of craigslist from a 1978 c10. Its a 250.

The exhaust manifold is an odd size. I keep ordering the exhaust flange to hook up the exhaust(walker 31883) but it comes in with holes spaced 3" apart and this particular manifold has the bolt spacing at 2-3/4. I've tried ordering the flange from a variety of sources but it comes back wrong each time. I think this may have to do with the 78 having the integrated or non integrated head. this particular one is non-integrated.

Here is the motor info:
The intake is a gm 343303 43 and exhaust is a gm504
motor: con2 f168 377127 gm 86 then behind distributor f0622tar

I took a look at the walker exhaust system website for the 78 and it shows two options for the 250 in that year. The first has the collar 31183 and then the second doesn't show a collar. I'm assuming possibly the collar was built into the exhaust pipe.

My question is this:
Can I use the exhaust manifold from the 65 230 engine I have (Blown engine) and then just hook up the stock exhaust easy.....or is there something Im missing on this 78 engine?

I just finished up the body work and bed so I'm broke and I know I should probably just take to midas and have them custom fit it but I'd like the finish up this ground up restoration myself and I have done every part of it so far.

[The Rocknrod]

Without looking at the manifold in question it would be difficult to answer.

[cwcarpenter98]

Got some pictures of the engine you put in?

If it's a non-integrated head, and the intake and exhaust ports line up with the old manifold you pulled off, you should be able to use the old manifold on the newer head

[geezer#99]

Is it possible you have a 292 manifold.
I think the newer 292’s had the 3 inch flange.
Of course pics help.

[LostMy65]

Don't know.
Nice red though.

[kljfamily]

Originally Posted by cwcarpenter98

Got some pictures of the engine you put in?

If it's a non-integrated head, and the intake and exhaust ports line up with the old manifold you pulled off, you should be able to use the old manifold on the newer head

ok thanks,

I know its a 250 from the engine # and the # behind the
distributor. I ran it on the novak site and it comes up as a 1978 250 out of flint for a c10.

also know its non integrated after looking at this post:
http://67-72chevytrucks.com/vboard/s...d.php?t=282381

I think I will just take your advise and swap out the stock exhuast manifold from the 78 with the original 65 I have and the problem should be solved thanks

[kljfamily]

Originally Posted by cwcarpenter98

Got some pictures of the engine you put in?

If it's a non-integrated head, and the intake and exhaust ports line up with the old manifold you pulled off, you should be able to use the old manifold on the newer head

ok thanks,

I know its a 250 from the engine # and the # behind the
distributor. I ran it on the novak site and it comes up as a 1978 250 out of flint for a c10.

also know its non integrated after looking at this post:
http://67-72chevytrucks.com/vboard/s...d.php?t=282381

I think I will just take your advise and swap out the stock exhuast manifold from the 78 with the original 65 I have and the problem should be solved thanks.

I also added phots of the engine if that helps

[Warrens69GMC]

flipped

[Warrens69GMC]

I'm not certain, but you may be missing the heat riser valve.

[kljfamily]

heat riser? thanks. I look that up and yes I do not have that piece on there.

2 questions.

1. is it necessary
2. would that possible change the bolt spacing?

[kljfamily]

OK, I did the research on the heat riser and answered my own question.

Thanks everyone