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Is their any difference between a 1967 HP manifold and the more common 68-69????
Value, to some. The 67 440 HP manifold casting is one year only.
I was told that there was a difference in the positioning of the holes of one of the manifold flanges. Haven’t compared, and don’t know for sure.
Is it 1 year only because of casting dates? or is it of different design??
Casting number is unique as far as I know. Some one who is actually smart will come along soon and correct me I'm sure!
Right hand manifold in 67 is the same as 68-69. The left hand manifold is a different casting than the 68-69. 383 & 440 heads are the same so there can be no difference in holes. The difference is in the fasteners used on the LH manifold. I'm not sure about the outlet angle on the LH manifold, but when Don of. Don's mufflers was alive, I had to specify 67 GTX and original manifolds when he made H pipes for me.
On the 67 left hand side manifold the outlet angle is different than one for a 68-69. So the H pipe will be different. The 67 left side manifold is a one year only HP manifold and when it is on the car, the casting number is upside down. Makes it easy to identify. I would not think that one would have a performance advantage over the other.
I have 67 pair......and 68/69 for sale here on the forum if that interests you