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63 SS convertible 67 SS 4 spd
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I went through this a while back. It is my understanding that there is a regular gasket on top of the manifold. Then the metal gasket, which on mine blocks off the cross over channel on the front of the manifold, and then a regular gasket to seal between the metal block off and the carburetor.
 

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Originally it had an asbestos type gasket on the manifold and the thin metal on top.

There was no gasket on top of the metal and the carb sat directly on top of it.

The metal plate insulates the carb from the exhaust crossover passage.

The exhaust crossover passage provides warm up heat for the carb.

The gasket and metal can be installed upside down so beware.

Thanks
Randy

Plate : 3884576

Gasket: 71-13689-00
 

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Discussion Starter · #6 ·
Originally it had an asbestos type gasket on the manifold and the thin metal on top.

There was no gasket on top of the metal and the carb sat directly on top of it.

The metal plate insulates the carb from the exhaust crossover passage.

The exhaust crossover passage provides warm up heat for the carb.

The gasket and metal can be installed upside down so beware.

Thanks
Randy

Plate : 3884576

Gasket: 71-13689-00
Thank you Randy I did some research on this metal plate and they said it is for colder weather climates so I guess I don't need it cause it is only driven in the summer
 

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The plate also acts like a gasket to seal the exhaust from leaking.

Some plug the passages if they don't want the warming feature.

Exhaust actually runs through a passageway below the carb.

Still, use the correct gasket and stainless plate on your intake.

Its asymmetrically shaped to match the correct gasket.

This is assuming you have the correct intake??

1970 and newer relied on an exhaust manifold tube only.

They didn't use the passageway below the carb. anymore.

They also used a different choke if originality is an issue.

Thanks
Randy

Thank you Randy I did some research on this metal plate and they said it is for colder weather climates so I guess I don't need it cause it is only driven in the summer
 

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Discussion Starter · #9 ·
The plate also acts like a gasket to seal the exhaust from leaking.

Some plug the passages if they don't want the warming feature.

Exhaust actually runs through a passageway below the carb.

Still, use the correct gasket and stainless plate on your intake.

Its asymmetrically shaped to match the correct gasket.

This is assuming you have the correct intake??

1970 and newer relied on an exhaust manifold tube only.

They didn't use the passageway below the carb. anymore.

They also used a different choke if originality is an issue.

Thanks
Randy
Thankyou Randy I will install the steel plate
 

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Good for you !!

I'm guessing you must be an old codger like me as you bought it new.

I grew up with them and have owned many Acadians and Novas.

They were my favorite car model for many years.

Hopefully you post some pictures!!

Thanks
Randy
 

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Discussion Starter · #13 ·
Good for you !!

I'm guessing you must be an old codger like me as you bought it new.

I grew up with them and have owned many Acadians and Novas.

They were my favorite car model for many years.

Hopefully you post some pictures!!

Thanks
Randy
Hi Randy here are some pics of my car
 

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