Cure for warped manifold?

[Chris Haynes]

My exhaust manifold has warped and doesn't line up with the rear exhaust port. Is there a fix for this? I'm tired of replacing gaskets.

 

[Mitch//pa]

Buy a new one ... the ceramic coated ones are slick.
I usually do the intake with it.. no resurfacing needed

 

[Patrick L.]

If you have a case of an excessively droopy exhaust manifold then about the only fix is a new manifold.
This a common malady with these monsters. A bit of a droop usually isn't much of an issue, but, it appears yours is excessive.

 

[denniskliesen]

I bought a new one from Snyder's and a can of their exhaust manifold paint. I've been driving it every other day since the middle of January. The paint is holding up beautifully.

 

[Model A Nick]

I bought one from Berts new with a new intake, both matched up correctly with no machining necessary.

 

[Terry NJ]

Replace it with a heater manifold. All that metal on the topside prevents it from sagging.
Terry

 

[Mark in MT]

I tried to fix the droop, made a fixture from 8" I-beam to hold it while pushing it back into shape. Burned up a 1/2 bottle of gas getting it hot, pushed it gently back with pusher bolts, cooled it slowly, still it cracked. Fixture now resides behind shop door collecting dust. When I need a good manifold, I get a new one, never been disappointed.

 

[JDupuis]

Terry is right about the old heater manifolds. They don't sag. But it is not usable with the manifold cooker! . I can't cook with my Fordor. Jeff

 

[Big hammer]

I have an Ottwell flat top heater :-( What a pain to get at the distributor hold down !
It cooks really good--- in the summer!

 

[RonC]

The new ones are great

 

[Chris Haynes]

Thanks for the information.

 

[Tom Wesenberg]

The repro exhaust manifolds I've seen have been excellent in looks and fit.

 

[Ray in La Mesa]

As an added aside, with the new manifolds, sometimes the intake is surfaced to much to match the new exhaust and needs to be built up. Up to a 3/16" or a1/4" layer of brazing on the intake ports can be milled to match the exhaust. Once filed 0n the outside edge and machined with the exhaust, and painted, you can't tell.

 

[SeaSlugs]

Is there only one company repoing exhaust manifolds or are there 2? i seem to think that there is the later 31 style out there that has extra reinforcement to help pevent sagging then the standard 28-E31?

 

[Chris Haynes]

Is there only one company repoing exhaust manifolds or are there 2? i seem to think that there is the later 31 style out there that has extra reinforcement to help pevent sagging then the standard 28-E31?

Snyder's has both.

 

[Brian T]

Is there only one company repoing exhaust manifolds or are there 2? i seem to think that there is the later 31 style out there that has extra reinforcement to help pevent sagging then the standard 28-E31?

The last 6 months of production had the reinforced manifolds, they were available from the vendors but not anymore, I have been fortunate to have found 2 at swap meets, one of which was a Ford casting they have a # stamped in the downpipe, the other was a re-pop with rougher casting texture, the point car owners buy them.

 

[foxfire42]

FWIW, the late 31's droop too.

 

[Brian T]

FWIW, the late 31's droop too.

Thats for sure! --- I found this one as I was leaving a swap meet, I had looked at 3 others that day that had other problems, this one had no pitting, however looking at it when I got it home I now know why I only paid $5.00 for it.
I suspect it had been in a garage fire, I cant believe an engine could run so retarded and lean to get that hot, Oh well its in the dump now waiting for an archeologist to figure it out.

 

[BILL WILLIAMSON]

I "thought" about a flat iron, welded to the head pipe, & extending up to a manifold stud, to prevent SAGGING.
Bill Sleepless