2806178 Intake Manifold Replacement - What Date Code do I need?

[kiwigtx]

No time for me to back read. Have the heads ever been planed? (machined) If so, depending on how much they milled off, the intake surfaces will not match the intake surface angles.

That manifold may have been machined in the distant past to match a set of heads that were shaved - which means that any new heads will never match the manifold.

I know this from experience.

Also....be aware @Michael_ that there are different 440 intake gaskets (Turkey pans) - some with heat exchange holes, and some without.

(Disclaimer ....I didn't back-read that much either.)

 

[Michael_]

So meanwhile the new NOS gaskets arrived and yesterday we redid the job.
Same story. It held up for about 30-40miles and then started leaking again. Pretty bad and on both sides. I can almost kill the engine spraying carburetor cleaner along the left or right side of the intake manifold.
This time we did not use any RTV except on the china walls. We reused the original manifold this time around.
We dry fitted the intake manifold (without the valley pan) and used a straight edge on both the heads and manifold and it looked good to us. But we are not engine builders so take this statement with caution.
We used 40 ft lbs of torque and used the right torque sequence.
We reused the original intake manifold bolts but they looked fine and this is not a problem from what i researched?

Anyway at this point i think it can only be both heads being warped or both intake manifolds being warped. (Or the second one i bought being machined in the past and/or both heads being machined in the past)

I do not really see another possibility. Do you guys?
(In some of my earlier posts i also posted a bunch of pictures of us changing the gasket if you want to look at those.)

At this point i get the feeling that the first owner parked the car after getting the diagnosis of 2 warped heads.
And the guy who sold the car to me probably also found that out and then sold the car to me...
And i probably didn't even notice at first until it got worse...

 

[Orig69]

I don't know that. It would surprise me but at this point also not that much.
But what do you do in this case i mean taking something off the manifold just makes this worse i assume?

The case against this is that i own the car for 5 years now and while i have not been driving nearly as much as i wanted because of unplanned personal stuff happening i have surely put at least 500 miles on the car before it started leaking.
Also the old valley pan gasket looked like it has been in there for a long time. Though while i don't know for sure i think it was not the first/original one.

Do you have a picture of the original valley pan?

 

[Michael_]

Do you have a picture of the original valley pan?

Unfortunately i threw it away but YES i do have a picture: My Gallery — Postimages