Date codes on selected heads: An opportunity to contribute
- Thread starter Tom Kochtanek
- Start date
1147 heads:
H 23 60
L 20 60
Dave
H 23 60
L 20 60
Dave
I currently have two sets of 690 heads but I used to own a 3rd set for which I have data.
690 J2561 pinned
690 J2561 pinned
690 L1861 originally pinned, now has 7/16 screw-in studs
690 A2662 originally pinned, now has 7/16 screw-in studs
690 B1562 pinned (sold several years ago)
690 L1961 pinned (sold several years ago)
I hope this helps.
Eric V.
690 J2561 pinned
690 J2561 pinned
690 L1861 originally pinned, now has 7/16 screw-in studs
690 A2662 originally pinned, now has 7/16 screw-in studs
690 B1562 pinned (sold several years ago)
690 L1961 pinned (sold several years ago)
I hope this helps.
Eric V.
early 690s
Eric:
Those J 25 61s are pretty early castings, can't remember if we've seen any before that. Would go great with my March 24 1961 "068" block
.
Thanks!
TomK
Eric:
Those J 25 61s are pretty early castings, can't remember if we've seen any before that. Would go great with my March 24 1961 "068" block
.Thanks!
TomK
Tom, here's a couple of previous posts. I don't have them anymore, they were sold to another member.
Dave
Posted 04-16-07
690 J 24 61 not pinned
690 K 1 61 not pinned
Posted 04-09-07
Here's an interesting one...... There is a set of 690's on Ebay that are K 25 61 and K 27 61 that are pinned. 409 Chevy Performance has K 25 61 that are not pinned. Maybe they started putting the pins in after lunch on Nov 25/61
Dave
Posted 04-16-07
690 J 24 61 not pinned
690 K 1 61 not pinned
Posted 04-09-07
Here's an interesting one...... There is a set of 690's on Ebay that are K 25 61 and K 27 61 that are pinned. 409 Chevy Performance has K 25 61 that are not pinned. Maybe they started putting the pins in after lunch on Nov 25/61
Went snooping today and found these heads:
3781147=A1761 GM3 1 ex stud pinned
3781147=D2360 GM1
3852583=CFD GM2 8
3852583=CFD GM2 260
OTHER ITEMS THAT MIGHT BE OF INTEREST
3732793=GMLH3 Exhaust Manifold
3732793=GMLH4 Exhaust Manifold
3732794=GMRH3 Exhaust Manifold
3732794=GMRH6 Exhaust Manifold
3844472=GM2D Intake Manifold
3732757=GM1 2858 Intake Manifold
3749948=GM2D1960 Intake Manifold
3781147=A1761 GM3 1 ex stud pinned
3781147=D2360 GM1
3852583=CFD GM2 8
3852583=CFD GM2 260
OTHER ITEMS THAT MIGHT BE OF INTEREST
3732793=GMLH3 Exhaust Manifold
3732793=GMLH4 Exhaust Manifold
3732794=GMRH3 Exhaust Manifold
3732794=GMRH6 Exhaust Manifold
3844472=GM2D Intake Manifold
3732757=GM1 2858 Intake Manifold
3749948=GM2D1960 Intake Manifold
Tom,
I'm a little(?) slow. I was reading some old posts.
I have a set of 690 heads K 6 61 that are not pinned & have screw in studs. Didn't check the pushrod size. I can send a pic if you'd like.
No, there is NO evidence of them having ever been pinned.
I had asked both Tony & Donnie Shaffer about them several years ago & surprisingly enough, Donnie had no comment(about the heads anyway....)
Gordon
I'm a little(?) slow. I was reading some old posts.
I have a set of 690 heads K 6 61 that are not pinned & have screw in studs. Didn't check the pushrod size. I can send a pic if you'd like.
No, there is NO evidence of them having ever been pinned.
I had asked both Tony & Donnie Shaffer about them several years ago & surprisingly enough, Donnie had no comment(about the heads anyway....)
Gordon
Gordon:
Thanks for the updated info. I suspect Donnie and Tony are more interested in the performance aspects of these heads as opposed to these sorts of details.
I sort of dropped the ball on recording all these a few years back....
Best,
Tom
Thanks for the updated info. I suspect Donnie and Tony are more interested in the performance aspects of these heads as opposed to these sorts of details
.I sort of dropped the ball on recording all these a few years back....
Best,
Tom
I will post several sets a little later. I have a set of 690's either E2461 or E1761, forgot which one, will check.Probably take ol' Phil a month to catalog all of his!
Tom, one thing I should add here if you think it applicable. I had a broken stud in my 409 (690 heads listed earlier)and when we Rockwell tested the original pinned stud that broke it was 40Rc which is VERY hard and brittle. I suspect the reason it broke was a combination of roller rocker/cam geometry and the high spring pressure resulting from the roller cam. I do not think I would trust the original pinned studs in any roller cam setup as all of them we took out when we changed to screw in studs were 38-40Rc and would potentially be suspect for failure.
Big Jim
Big Jim
I've got a pair of 690's
Both dated : 119 (April 29, 1962 ???)
Both pinned, but will have 7/16" screw-in studs soon.
I was told these are 1962 model heads. Is there any way to know when they have this style date code instead of the alpha numeric one?
Both dated : 119 (April 29, 1962 ???)
Both pinned, but will have 7/16" screw-in studs soon.
I was told these are 1962 model heads. Is there any way to know when they have this style date code instead of the alpha numeric one?
I'm thinking[maybe not the best idea 
] that the 583's were introduced with the 63 model cars which came on the scene in Sept. of 62.The heads would have been cast before that time by a month or so.With your heads having been dated in April of 62,they would have indeed been 62 model year heads.What I dont know,and maybe Cecil can shead some light on this ,is wheather the 583 was a first part,or mid year release.
] that the 583's were introduced with the 63 model cars which came on the scene in Sept. of 62.The heads would have been cast before that time by a month or so.With your heads having been dated in April of 62,they would have indeed been 62 model year heads.What I dont know,and maybe Cecil can shead some light on this ,is wheather the 583 was a first part,or mid year release.
In the book Chevrolet by the # ers,author Alan Colvin he does not list the 583 head anywhere........and it's titled 60-64.your thinkings usually pretty sound I believe Don.
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Correction,he does mention the 583 in a highlight that the "583 head was introduced Nov. 12 1963 and was used thru 1965".I believe August is the new model year,correct???
Yes Don,see what I mean about your thinking!!!