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Old 09-28-2021, 04:40 PM   #1
Lightman7
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Default Potential for manifold warping?

I am going to install a full flow oil filter on my 30 cabriolet. Engine was rebuilt 1990. What are the odds when I remove the manifolds to access the cover that they will warp when I take them off? Thanks.
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Old 09-28-2021, 05:26 PM   #2
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Default Re: Potential for manifold warping?

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Originally Posted by Lightman7 View Post
I am going to install a full flow oil filter on my 30 cabriolet. Engine was rebuilt 1990. What are the odds when I remove the manifolds to access the cover that they will warp when I take them off? Thanks.
No need to take the manifolds off to get the valve cover off.

John
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Old 09-28-2021, 05:45 PM   #3
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Default Re: Potential for manifold warping?

High temperature heat cycles will warp cast iron. Taking the exhaust manifold off the engine will not warp it. Either it is warped or not before you take it off. The rings that fit between the exhaust manifold and the block will prevent warping. The intake manifold does not have the same degree of heat cycles that the exhaust manifold does so it will not be warped.
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Old 09-28-2021, 06:08 PM   #4
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Default Re: Potential for manifold warping?

Take the carb off and it will give you more room with the valve cover off. That installation is fairly easy but trial fit it first without a gasket because the bolt holes may be off a small fraction. Jiggle it around and it will go on, or very slightly enlarge the holes with a round file,.
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Old 09-30-2021, 09:46 AM   #5
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Default Re: Potential for manifold warping?

I think I'm missing something. The two leftmost bolts (upper and lower) on the valve cover have a fraction of an inch clearance between their heads and the exhaust manifold. There is no way I can back those out without damaging the exhaust manifold. What am I not seeing?
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Old 09-30-2021, 10:22 AM   #6
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Default Re: Potential for manifold warping?

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If you need to take of the exhaust manifold, then take it off. You will not warp anything that is not already warped. On my car there is a half inch clearance for the last two bolts, so your exhaust manifold has been modified or is another brand other than Ford.
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
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My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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Old 09-30-2021, 10:53 AM   #7
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Default Re: Potential for manifold warping?

The two left most bolts can be taken off and on with the manifold in place. Have done it occasionally to adjust lifters. Use a half inch 15 degree box wrench, and fingers. It is awkward fit but can be done. Of course the second time is easier than the first which is one reason for the trial fit. Try it, You can always remove the manifolds if you have to. Assuming you have a stock manifold as mentioned above.
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Old 09-30-2021, 11:00 AM   #8
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Default Re: Potential for manifold warping?

An opened ended wrench will take that bolt out from the upper left corner. It is very possible though that someone installed the valve cover with a longer bolt than they should have, then installed the manifold afterwards.

regardless, then just take off the manifold if the bolt hits.
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Old 09-30-2021, 11:28 AM   #9
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Default Re: Potential for manifold warping?

I don't think the exhaust manifold is stock, solely because it has a clamp on to the exhaust pipe. I don't think that is stock.
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Old 09-30-2021, 12:12 PM   #10
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Default Re: Potential for manifold warping?

Stock clamp looks like the one in this link. Is yours like that? It could be that a lot of the face of the stock manifold was machined off at one time to bring the exhaust closer to the block.

https://www.snydersantiqueauto.com/P...MANIFOLD--USA-
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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Old 09-30-2021, 06:13 PM   #11
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Default Re: Potential for manifold warping?

You guys should try taking the valve cover off in a RHD car! As I have said many times before, you don't know how easy you have it. On our cars, it the manifolds have been machined flat, there is a good chance you won't be able to use the clutch. The pedal arm goes between the exhaust clamp and the block and there is not much room there. Fitting the clamp is an acquired art with an original clamp so we modify them so there is no nut. We simply put a helicoil in one side and use a shorter bolt. Did I say you guys don't know how easy you have it. In this area (the engine bay), Henry didn't think things through well at all.
BTW, the advice above is good, IMO.
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Old 09-30-2021, 06:48 PM   #12
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Default Re: Potential for manifold warping?

Synchro, I see your dog has the leg you used to use for the clutch pedal. Or is that the one for the brake?
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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Old 10-01-2021, 06:22 AM   #13
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Default Re: Potential for manifold warping?

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Synchro, I see your dog has the leg you used to use for the clutch pedal. Or is that the one for the brake?
Must be the clutch. The brakes don't work. That leg is from a pedestrian who was a bit slow.
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