HP exhaust manifold date codes

[jhoop]

I have a couple of passenger side HP big block exhaust manifolds and I am trying to identify them.  I believe they are both from a 74 but I'm not for sure with the date codes and there isn't much info on these casting numbers.

First is casting # 3751294 date code: D273. The second is casting # 3769207 date code: F124

I have tried to figure out the date codes but can't figure it out so any help would be much appreciated.

[ODZKing]

Looks like the 3769207 is left for a 74 and is it possible the "2" is a "7" on the other? 3751794
Either that or it is off a "C" body from what I can tell.
Usually the casting is only a number or two from the part number as the part number is the manifold "Package".
There is a 3751292 - C body.  And not HP.
Sorry I couldn't help more than that.  You are correct in saying there isn't alot of info past 1971 out there.
I'm using parts books.

[jhoop]

Looks like the 3769207 is left for a 74 and is it possible the "2" is a "7" on the other? 3751794
Either that or it is off a "C" body from what I can tell.
Usually the casting is only a number or two from the part number as the part number is the manifold "Package".
There is a 3751292 - C body.  And not HP.
Sorry I couldn't help more than that.  You are correct in saying there isn't alot of info past 1971 out there.
I'm using parts books.

The casting # is defiantly 3751294 and these are both Right side manifolds.  Any idea what the date codes mean?

[ODZKing]

Exhaust manifolds are usually 3 digit.  for example the 27the week of 73 and 12th week of 74.  Not sure what the D and F are.

[69CoronetRT]

Exhaust manifolds are usually 3 digit.  for example the 27the week of 73 and 12th week of 74.  Not sure what the D and F are.

Probably Months
D= April
F= June