The Ford Barn

Roadster Rich · 01-10-2016, 01:23 PM

I know I have read about this before, but for the first time face the situation on the engine I am working on. Here is a picture of the manifold I have taken off the car.

Manifold Post.jpg

There is between 1/8 and 3/16 inch with this straight edge lined up with the outer two exhaust holes.

Do I need to replace with this condition?

kenparker · 01-10-2016, 01:44 PM

Lining up the old manifold complete with Intake and Gasket is a long shot. To me not worth it. I would spent the $100 and put aa new one on. ken

J Franklin · 01-10-2016, 02:57 PM

A fellow I knew made a jig to hold the manifold and it had a screw device to put reverse pressure on the sag while heating the manifold and successfully straightened the ports. I wish I had found it at his estate sale.

Mitch//pa · 01-10-2016, 03:56 PM

Quote:

Originally Posted by kenparker

Lining up the old manifold complete with Intake and Gasket is a long shot. To me not worth it. I would spent the $100 and put aa new one on. ken

X2 on that
I bought the porcelain coated one so far so good

RonC · 01-10-2016, 04:01 PM

Unless your going for show the new manifolds are great. Add an Aries muffler and you will have a correct sounding engine without an exhaust leak

BILL WILLIAMSON · 01-10-2016, 05:37 PM

Sponsored Links (Register now to hide all advertisements)

Small wonder that manifolds SAG! Just think of a RED HOT GLOWING MANIFOLD, with 7/8's of the weight of the ENTIRE exhaust system tugging down on it!
I've "thought" of a flat iron strap, from a clamp bolt & up to a manifold stud, for "support"----------
Bill W.

Tom Wesenberg · 01-10-2016, 05:59 PM

Yep, time for a new manifold, and use the steel rings.

Brian T · 01-10-2016, 06:33 PM

I wouldn't bother with the alignment rings that the venders sell they will shrink and end up in the muffler, I heard it said here while ago.

DougVieyra · 01-10-2016, 09:23 PM

Listen to RonC, post # 5 - He knows what I am talking about. That is he knows what he is talking about. That is he knows what most of us know. I would not bother buying the more expensive Porcelain manifold . . . . unless you plan on having the car for more than a decade. The same with the Aries (from Ford Blue Prints) - don't bother with the extra expense of the Stainless Steel muffler . .. . unless you plan on having the car for more than a decade. And if you do put on a new Aries (of whatever material) be sure to paint it with an extreme-heat paint.

I like the engineering idea behind the Gland Rings. I have used them for 50 years, and have never had them 'disappear'.

Roadster Rich · 01-11-2016, 08:03 AM

Thanks for the advice. I guess it is another expenditure that should happen. What are your thoughts about whether I need to pay for the new intake manifold to make sure all lines up correctly? I see a note at Bert's about getting the matching intake manifold also to assure alignment.

aermotor · 01-11-2016, 08:33 AM

It is possable that your manifolds have been milled, so the thickness of your intake manifold versus the new exhaust manifold would be the determining factor of buying a new intake.

John

jeep44 · 01-11-2016, 09:45 AM

That's why I used an Otwell heater on one of my As-all the original "regular" manifolds I had on hand had sagged-but the two heater manifolds I had were straight as an arrow-that extra cast iron had kept them from sagging.

Mitch//pa · 01-11-2016, 09:53 AM

I always get a new intake for previous milling reasons as aermotor stated... Half dozen one the other... With a new intake just plop it on without resurfacing...

Roadster Rich · 01-11-2016, 01:02 PM

Thanks to all. Looks like I will order both the intake and exhaust. More money than I intended to spend, but it always seems it is, and for most of us, we never regret the amount we spend on these cars of ours.

Terry, NJ · 01-11-2016, 01:42 PM

I believe that the heater manifolds don't warp due to the greater mass of metal in the area where the warping/sagging takes place. Furthermore, with all that metal on top, it acts as a cooling fin which prevents the distortion. I know, I had a stock manifold that I'm pretty sure was warped. I couldn't keep a gasket on the engine, it would always blow out on the top. Since I put the Autolite heater manifold on, i have not lost a gasket.
Terry

01-10-2016, 01:23 PM	#1
Roadster Rich Senior Member Join Date: May 2010 Location: Alpharetta, Georgia (Atlanta) Posts: 272	Exhaust Manifold Sag I know I have read about this before, but for the first time face the situation on the engine I am working on. Here is a picture of the manifold I have taken off the car. Manifold Post.jpg There is between 1/8 and 3/16 inch with this straight edge lined up with the outer two exhaust holes. Do I need to replace with this condition?

01-10-2016, 01:44 PM	#2
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: Exhaust Manifold Sag Lining up the old manifold complete with Intake and Gasket is a long shot. To me not worth it. I would spent the $100 and put aa new one on. ken

01-10-2016, 02:57 PM	#3
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,963	Re: Exhaust Manifold Sag A fellow I knew made a jig to hold the manifold and it had a screw device to put reverse pressure on the sag while heating the manifold and successfully straightened the ports. I wish I had found it at his estate sale.

01-10-2016, 04:01 PM	#5
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: Exhaust Manifold Sag Unless your going for show the new manifolds are great. Add an Aries muffler and you will have a correct sounding engine without an exhaust leak

01-10-2016, 05:37 PM	#6
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: Exhaust Manifold Sag Sponsored Links (Register now to hide all advertisements) Small wonder that manifolds SAG! Just think of a RED HOT GLOWING MANIFOLD, with 7/8's of the weight of the ENTIRE exhaust system tugging down on it! I've "thought" of a flat iron strap, from a clamp bolt & up to a manifold stud, for "support"---------- Bill W. __________________ "THE ASSISTANT GURU OF STUFF"

01-10-2016, 05:59 PM	#7
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Exhaust Manifold Sag Yep, time for a new manifold, and use the steel rings.

01-10-2016, 06:33 PM	#8
Brian T Senior Member Join Date: May 2010 Location: San Diego,Ca Posts: 1,377	Re: Exhaust Manifold Sag I wouldn't bother with the alignment rings that the venders sell they will shrink and end up in the muffler, I heard it said here while ago. __________________ Nothing can be made foolproof, ---- fools are ingenious bastards.

01-10-2016, 09:23 PM	#9
DougVieyra Senior Member Join Date: Sep 2012 Location: Eureka, California Posts: 1,716	Re: Exhaust Manifold Sag Listen to RonC, post # 5 - He knows what I am talking about. That is he knows what he is talking about. That is he knows what most of us know. I would not bother buying the more expensive Porcelain manifold . . . . unless you plan on having the car for more than a decade. The same with the Aries (from Ford Blue Prints) - don't bother with the extra expense of the Stainless Steel muffler . .. . unless you plan on having the car for more than a decade. And if you do put on a new Aries (of whatever material) be sure to paint it with an extreme-heat paint. I like the engineering idea behind the Gland Rings. I have used them for 50 years, and have never had them 'disappear'.

01-11-2016, 08:03 AM	#10
Roadster Rich Senior Member Join Date: May 2010 Location: Alpharetta, Georgia (Atlanta) Posts: 272	Re: Exhaust Manifold Sag Thanks for the advice. I guess it is another expenditure that should happen. What are your thoughts about whether I need to pay for the new intake manifold to make sure all lines up correctly? I see a note at Bert's about getting the matching intake manifold also to assure alignment.

01-11-2016, 08:33 AM	#11
aermotor Senior Member Join Date: Mar 2015 Location: Greenville, SC Posts: 1,099	Re: Exhaust Manifold Sag It is possable that your manifolds have been milled, so the thickness of your intake manifold versus the new exhaust manifold would be the determining factor of buying a new intake. John

01-11-2016, 09:45 AM	#12
jeep44 Senior Member Join Date: Sep 2011 Location: canton,michigan Posts: 312	Re: Exhaust Manifold Sag That's why I used an Otwell heater on one of my As-all the original "regular" manifolds I had on hand had sagged-but the two heater manifolds I had were straight as an arrow-that extra cast iron had kept them from sagging.

01-11-2016, 09:53 AM	#13
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Exhaust Manifold Sag I always get a new intake for previous milling reasons as aermotor stated... Half dozen one the other... With a new intake just plop it on without resurfacing...

01-11-2016, 01:02 PM	#14
Roadster Rich Senior Member Join Date: May 2010 Location: Alpharetta, Georgia (Atlanta) Posts: 272	Re: Exhaust Manifold Sag Thanks to all. Looks like I will order both the intake and exhaust. More money than I intended to spend, but it always seems it is, and for most of us, we never regret the amount we spend on these cars of ours.

01-11-2016, 01:42 PM	#15
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Exhaust Manifold Sag I believe that the heater manifolds don't warp due to the greater mass of metal in the area where the warping/sagging takes place. Furthermore, with all that metal on top, it acts as a cooling fin which prevents the distortion. I know, I had a stock manifold that I'm pretty sure was warped. I couldn't keep a gasket on the engine, it would always blow out on the top. Since I put the Autolite heater manifold on, i have not lost a gasket. Terry