Hipo heads irregularity

[pbf777]

the 73 heads appeared to have a provision that are not drilled out as far as I can tell.

    The "provision", or recess, in the location of, if equipped, the thermactor plumbing is not "as cast", rather the recessed porting is of a "machining operation"; and if so, then if looking into the exhaust port isn't there a small casting boss presenting a bored thru-hole visible in that upper corner of the port? 

    Now you might have to look for details, as I see the heads have had some porting work done and it is often practiced to plug these passages; often with some rather creative processes. 

    Also, anybody know how late, chronologically, did Ford produce "service-replacement" castings for the 289 H.P.? 

    Scott.

[J_Speegle]

Cory here is what I can offer to the effort. Unfortunately many of my pictures don't have detailed pictures of all surfaces but this is what I could make out

Casting Date    "4V" present?                     Additional Details
    5K2                Yes 4V
    5K4                Yes 4V
    7F1                 No 4V               Has emission "bump" in the upper left of exhaust port face undrilled
    7H23              No 4V               Has emission "bump" in the upper left of exhaust port face undrilled

    0M4               No 4V               C8ZE Service replacements with emission port machined, drilled + threaded
    3A6 (1973)     No 4V               C8ZE Service replacements with emission port machined, drilled + threaded

Couple more out in the garage I will check for 64-66's

[6s1640]

6M22 with thermactor ports
No 4V.
These may be service heads.
Is there a way to tell if they are?

Hi S412Gofast,  because the heads have a December 1966 casting date code, they could be either - Production for a 1967 GT350 or a service part.  Because it has the 65 cast into as well, I'd guess more likely a production head for 1967.  The service heads with C8ZE are definitely service parts.

Cory

Cory

[S412gofast]

6M22 with thermactor ports
No 4V.
These may be service heads.
Is there a way to tell if they are?

Hi S412Gofast,  because the heads have a December 1966 casting date code, they could be either - Production for a 1967 GT350 or a service part.  Because it has the 65 cast into as well, I'd guess more likely a production head for 1967.  The service heads with C8ZE are definitely service parts.

Cory

Cory

Cory
thanks for this info!

Carl

[Bob Gaines]

6M22 with thermactor ports
No 4V.
These may be service heads.
Is there a way to tell if they are?

Hi S412Gofast,  because the heads have a December 1966 casting date code, they could be either - Production for a 1967 GT350 or a service part.  Because it has the 65 cast into as well, I'd guess more likely a production head for 1967.  The service heads with C8ZE are definitely service parts.

Cory

Cory

I would add the head your discussing with thermactor ports would be a production head for a thermactor equipped 67 GT350. The non thermactor cars did not typically receive thermactor heads.

[pbf777]

The non thermactor cars did not typically receive thermactor heads.

    Just to add to the above:  And to the best of my experience, the castings were the same, this with the provision of additional cast iron material, but they just were not machined for the thermacter plumbing. 

    And this leads me to the inquiry of the cylinder head numbers I provided, this being of: "3D18" & "3D24" and with the fact that they as stated: "'do not' have casting provisions for the passage nor the plug/bunghole machining", my "first knee-jerk reaction" was that these were of 1973 casting production, but without the casting provisions for thermacter plumping, could these possibly be actually of 1963 production?  If so, it seems they would prove to have been awfully early "289 H.P." stuff.   

    Do we have any known examples of 1970's "service" head production without thermacter provisions of some degree, at least if only as cast?   

    Scott.

[S7MS427]

Pictures of the two heads I used for my engne build reveal the following:

Casting Date  "4V" Present
5H23 (ID 20)     Yes
5H26 (ID 19)     Yes

[J_Speegle]

The non thermactor cars did not typically receive thermactor heads.

    Just to add to the above:  And to the best of my experience, the castings were the same, this with the provision of additional cast iron material, but they just were not machined for the thermacter plumbing.  .........

That would follow the same pattern used for standard non-Thermactor 289 heads which had the addition material on the exhaust port just not drilled or machined for use on a Thermactor car

[Dan Case]

And this leads me to the inquiry of the cylinder head numbers I provided, this being of: "3D18" & "3D24" and with the fact that they as stated: "'do not' have casting provisions for the passage nor the plug/bunghole machining", my "first knee-jerk reaction" was that these were of 1973 casting production, but without the casting provisions for thermacter plumping, could these possibly be actually of 1963 production?  If so, it seems they would prove to have been awfully early "289 H.P." stuff. 
    Scott.

HP289  pieces. The majority of 1963-64 model year engines had cylinder head assemblies that were based the C3OE-E and C3OE-F versions of cylinder head castings; machined as 1963-64 model year specification pieces. The C4OE-B head casting was introduced about April 1964 for 1964 engines near the end of the 1964 model year. C5OE-A head castings made it into "1964" HP289 engines the last few weeks of the 1964 engine model year for some of the last regular production five bolt bell housing HP289 engines made.

1963 HP289 engine number 1241 (near the end of 1963 engine production) was installed in a Fairlane. The engine was assembled May 20, 1963. Both cylinder head castings were C3OE-E casting models and their casting dates were 3D18 and 3D24.

By chance are the "3D18" and "3D24" dated castings you have the C3OE-E casting model?

[pbf777]

By chance are the "3D18" and "3D24" dated castings you have the C3OE-E casting model?

    Well, I said to my self: "yeah, with that date code they'd have to be, right?"  So now (thanks Dan!  ), I've gotta go drag 'em out to "verify" what they might actually be, versus what I thought I remembered them to be.  But then that isn't such an easy task ya' know, as we put them on that shelf probably 35-40, or so, years ago, and an awful lot of other "stuff" has migrated, some somewhat precariously, on top of 'em at this point!    

    But anyway, to answer your question:  No, they're "C5OE" castings. 

    And then, since I had to go digging and look just to be sure, I came a cross another set    (man, . . . . the "stuff" ya' find!  ), so for the survey add:   "5D23" (pr.) No "4V"

    Scott.