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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: xs29j8]
#1544257
12/10/13 11:32 PM
12/10/13 11:32 PM
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Joined: Jan 2003
Posts: 3,115
Sacramento,California
JRepucci
master
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master
Joined: Jan 2003
Posts: 3,115
Sacramento,California
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Quote:
Quote:
Jason,
There is a better easier way to tell early vintage from later vintage. If you look at the pic you posted of your later manifold you will see it has the revised casting where the manifold ports meet the head (they are more smoothed) This was started in 1969. Allen's pic of his RH manifold has the "step" at the ports where the manifold meets the head. (pic right above yours)
As a side note: all the repro manifolds have the stepped ports since they were modeled after early manifolds. Which is really funny when they cast the 34xxxxx Ebody style part # into it
Allen, Can you post close up pics of the ports?
Which RH manifold do you want close-up pics of? Here are a few of the "12JB" manifolds... anyone willing to help on the date code?
I don't know what to tell you about those dates. But here is a 10-69 manifold with the more usual dating style.
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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: JRepucci]
#1544258
12/11/13 12:21 AM
12/11/13 12:21 AM
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Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
xs29j8
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
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Quote:
Quote:
Quote:
Jason,
There is a better easier way to tell early vintage from later vintage. If you look at the pic you posted of your later manifold you will see it has the revised casting where the manifold ports meet the head (they are more smoothed) This was started in 1969. Allen's pic of his RH manifold has the "step" at the ports where the manifold meets the head. (pic right above yours)
As a side note: all the repro manifolds have the stepped ports since they were modeled after early manifolds. Which is really funny when they cast the 34xxxxx Ebody style part # into it
Allen, Can you post close up pics of the ports?
Which RH manifold do you want close-up pics of? Here are a few of the "12JB" manifolds... anyone willing to help on the date code?
I don't know what to tell you about those dates. But here is a 10-69 manifold with the more usual dating style.
Here is a thread about a 12JB/20JB pair:
http://www.cuda-challenger.com/cc/index.php?topic=92783.0
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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: hemi70se]
#1544260
12/12/13 01:09 PM
12/12/13 01:09 PM
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Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
xs29j8
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
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Quote:
Allen,
Unfortunately that one close up pic you showed of the flange is so surface rusty I can't say which style it is. Need some better pics
Will do... The ice storm has prevented me from getting out to the shop the manifolds are in, but I expect I can get some more pictures this weekend...
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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: fjmg]
#1544263
02/03/14 12:06 AM
02/03/14 12:06 AM
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Joined: Jan 2003
Posts: 10,721
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,721
North Dakota
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I have a set that came off an early production 1970 Hemi Roadrunner (delivered about December 20, 1969). Here are the casting numbers from those.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: 6PakBee]
#1544264
02/03/14 12:07 AM
02/03/14 12:07 AM
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Joined: Jan 2003
Posts: 10,721
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,721
North Dakota
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Other one, sorry for the crappy picture.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Hemi Exhaust Manifolds Date Code "12JB"... ???
[Re: 6PakBee]
#1544265
02/03/14 01:05 AM
02/03/14 01:05 AM
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Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
xs29j8
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,624
Fort Worth, Texas
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Quote:
I have a set that came off an early production 1970 Hemi Roadrunner (delivered about December 20, 1969). Here are the casting numbers from those.
Thanks for the contributions guys, we might get this figured out if we get enough data points... On this one, the date code might read 
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... 
... Any help would very much be appreciated... If you don't want to post the info, please PM me or email 
