Topic: Cleveland Engine Plant Oil Pan Fasteners

[Bossbill]

On 67 289s (Cleveland) what are the common markings on oil pan bolts?

I show two different 5/16-18 end bolts in Circle E style or fancy F with
B&H being used on the smaller 1/4-20s.
See pics.
Is this what others see as well?

Even though the small bolts are listed as "Plain finish" I think a quick plate of zinc would help keep the rust away. They get painted anyway, but you can't be sure paint will get to the oil pan side.

[67gta289]

Mine has the Circle E style.  289 Cleveland December 66 change level 15

[jwc66k]

Even though the small bolts are listed as "Plain finish" -

That is not true. The only information about engine hardware available to us (remember, engines were sent to the assembly line as a "completed part", aka sub-assembly) is from Ford Car Parts, aka MPC, and as such, many were identified by a Ford Locator Code along with the Ford hardware part number. That Ford hardware part number did not include a finish number. The "Locator Code" and its associated documentation included the finish code for the parts to be made. These parts were after assembly line installation and into dealer service parts realm. If more than one finish for the same hardware part number was used over the years, that finish was consolidated into one. It is more economical to keep one item on the shelf than two, and as we've seen, Ford was "economical".

- I think a quick plate of zinc would help keep the rust away. They get painted anyway, but you can't be sure paint will get to the oil pan side.

Most of those screws/bolts were either cad plated or clear zinc plated just "to keep the rust away".
Jim

[Bossbill]

I should have said listed in your spreadsheet as "-S".
I also understand it was part of the engine assy and as such the assembly manual did not list it.

But I subjected a few to the muriatic acid bath and got no bubbles. All of the zinc or cad bolts I have refinished fizzled when placed in acid as the coating got removed.

What about the B&H marking?

[jwc66k]

But I subjected a few to the muriatic acid bath and got no bubbles. All of the zinc or cad bolts I have refinished fizzled when placed in acid as the coating got removed.

Consider this. The bolts were painted. Therefor they must not have any rust or oil on them. That included the manufacturing process, shipping, storage and installation. The only preservative used in that era was cad or zinc plating. The same type of hardware was also used on valve covers. So include that in your search.

What about the B&H marking?

I would say that is normal.
Jim

[Bossbill]

I keep thinking Benson & Hedges!

[jwc66k]

I keep thinking Benson & Hedges!

You need to kick the habit.
One more consideration. AMK sells one of the bolts in question, 373071-S8. Max (he owns AMK) has access to Ford documentation. I would venture to say that AMK hardware is in the very high 90 percent bracket for hardware finish accuracy (I did provide a couple of finish corrections to AMK about 25 years ago). Head markings are a different story. There are few original supplies left. The smaller screw, 373071-S8, 1/4-20 X 5/8 inch, had many suppliers in the 60s and 70s. I have a half dozen different head markings of them, and three different grades, 2, 5  and 5.1.
Jim