`67 GS400 Exhaust manifold casting #`s help!

George
my curiousity got the best of me so i drove out to the shop tonight and shot a couple pictures if the manifold. i think it raises more questions than it answers though. mine has the same casting number as yours but is different looking

 

casting number. mine is from a california car with the a.i.r injection heads

 

Hey thanks Bob you didnt have to go out there tonight,now i see the difference,very odd,it puzzles me like the casting # difference between manifolds used on `67 GS 400`s,mine has the 1377139-1 number which yours has the 1377139-2.

Thanks

 

George
I wonder if maybe Buick didnt use the heat riser valve in warmer climate cars for areas such as arizona and florida and California. that would make sense as to why there are 2 variations of the same manifold and casting number.

 

Yea you might be right it makes sense,but how about all the other casting #`s?

Thanks

 

Mine matches Bob's...although the dash number is different. o No:

 

Thats really wierd stuff,if you notice in my pic you cannot read the casting number that well because its not as clear as yours or Bobs.

Thanks

 

Interesting....I just went over to Greg Gessler's web sight. All the manifolds shown have the tapered seat like yours.

Maybe shoot Greg an email. Since he ports these things all the time I'm sure he's seen every configuration and may have an answer.

http://www.gesslerheadporting.com/m...d8088fca8bdf459085256e1c000b7f10!OpenDocument

 

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