Oil Filler Cap Article Clarification - Joe Tripoli

[Owen L.]

In the Summer '23 Restorer, an article by Joe Tripoli, has one thing I believe needs clarification:

Oil filler caps for '69-'70 (#6410893) are to have "ENGINE OIL FILL AC-FC2" stamped into them, yet, the article states no Corvettes had oil caps stamped with "ENGINE OIL FILL ACFC2".

Is the missing hyphen on the oil cap stamp the detail to make one correct and one not or is this an article content contradiction? If the whole thing rests on the hyphen, perhaps a sentence indicating that would have been invaluable to those searching for the correct cap.

[Joe L.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

In the Summer '23 Restorer, an article by Joe Tripoli, has one thing I believe needs clarification:

Oil filler caps for '69-'70 (#6410893) are to have "ENGINE OIL FILL AC-FC2" stamped into them, yet, the article states no Corvettes had oil caps stamped with "ENGINE OIL FILL ACFC2".

Is the missing hyphen on the oil cap stamp the detail to make one correct and one not or is this an article content contradiction? If the whole thing rests on the hyphen, perhaps a sentence indicating that would have been invaluable to those searching for the correct cap.

Owen------


Attached are photos of an absolutely known-original 1969 oil filler cap for300 HP valve covers and it has the hyphen between "AC" and "FC" . Was every one embossed "AC-FC2" rather than "ACFC2"? I don't know as I have not seen every one. I'm sure that AC had multiple sets of tooling for these caps as they were being used across all GM car and truck lines at the time.

By the way, as far as 1969-70 Corvettes go, the FC2 caps were used only for 300 HP engine applications. All other engines used chrome caps manufactured by Stant and so-identified.


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[Owen L.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

Thank you, Joe. This still begs the need for clarification regarding the hyphen in the chart vs. the text statement without. Are there non-Corvette caps that look the same except without the hyphen? Should the advice for owners be to pass up caps without?

[Joe L.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

Thank you, Joe. This still begs the need for clarification regarding the hyphen in the chart vs. the text statement without. Are there non-Corvette caps that look the same except without the hyphen? Should the advice for owners be to pass up caps without?

Owen------


The FC2 cap was used on a wide range of GM applications and not just Chevrolet. These included Buick, Pontiac, Oldsmobile and Chevrolet.

The FC2 cap was a cap of internal GM manufacture by the AC Spark Plug Division. Strangely, it was not the cap initially specified in SERVICE for 1969-70 Corvette 300 HP applications even though it was the cap used in PRODUCTION and was available in SERVICE at the time. The cap cataloged in SERVICE from the beginning was the GM #3835665. This is a very similar, non-chrome finished cap of Stant manufacture which could never be confused with an FC2.

As far as the FC2 caps without the hyphen after AC I have never seen one. However, that does not mean none were ever produced. As I mentioned, these caps were being manufactured in very large quantity at the time and there were likely many sets of tooling which could have differed in minor ways (and hyphen or no hyphen is decidedly a MINOR difference),

[Joseph T.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

Hello all. I received an e mail from Vinnie Peters requesting I reply to this thread. I must admit that I am not a frequent user on the TDB. I have read the above comments. It is my opinion that the hyphen belongs in between the AC and the FC. I checked my collection of oil caps and have only the ones with the hyphen. I also checked the 68-69 NCRS Judging manual 5th Edition, page 116, top paragraph, which calls out ENGINE OIL FILL AC FC2, with no hyphen. On the previous page, however, there is a picture of the cap, fig. 3.14, which shows the hyphen. I believe the writeup inadvertently omitted the hyphen. In the 70-72 NCRS Judging Manual, 6th Edition, on page 114, 4th paragraph down, it states ENGINE OIL FILL AC-FC2 (fig 3.22), with the hyphen. In retrospect, I should have just eliminated my comment on no hyphen, or clarified it. Sorry for the confusion, and thank you for your comments. I have no problem with you guys checking my work. I will not be going to the Nationals next week, but if I did, I would certainly look you guys up to say hello and talk Corvettes. Joe Tripoli #1641.

[Gary B.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

68-69 TIM&JG has been fixed.
Gary Bosselman

[Owen L.]

Re: Oil Filler Cap Article Clarification - Joe Tripoli

It is my opinion that the hyphen belongs in between the AC and the FC.
Joe Tripoli #1641.

Thank you, Joe, for the added details.