440 Exhaust Manifolds

[67 GTX]

Hey guys,

Does anyone know if the ports on a 440's 67 exhaust manifold are the same as on 70's?

I don't have the option to measure the sets on my own.

Thanks in advance!

 

[69 GTX]

I would say yes based on header applications.

 

[AR67GTX]

Do you mean the manifold outlet to the head pipe, or the openings mating up with the head? The outlets for a 67 are different on one side from 68/69 - I think the 70 manifolds are the same as 68/69 - not 100% sure. The other side is the same. From memory I think it's the left one that is different - rotated 90 deg.

 

[PurpleBeeper]

Do you mean the manifold outlet to the head pipe, or the openings mating up with the head? The outlets for a 67 are different on one side from 68/69 - I think the 70 manifolds are the same as 68/69 - not 100% sure. The other side is the same. From memory I think it's the left one that is different - rotated 90 deg.

This sounds close at least and likely 100% correct. The exhaust port on the heads & the inlet ports on the stock manifolds are the same, but the outlet location/direction of the exhaust manifold is different on one side. I've run headers for years & years, but I do remember something like that. Stock h-pipes might not line up & there might be some other issues too.

 

[67 GTX]

This sounds close at least and likely 100% correct. The exhaust port on the heads & the inlet ports on the stock manifolds are the same, but the outlet location/direction of the exhaust manifold is different on one side. I've run headers for years & years, but I do remember something like that. Stock h-pipes might not line up & there might be some other issues too.

Thanks guys. I was referring to the exhaust inlet/outlet ports. As long as a 67 vs 70 are the same there, then my fears can be alleviated.

 

[69 GTX]

Maybe some one can post a picture of the 67 closed chamber heads.