ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1968 Mustang => Topic started by: WT8095 on July 14, 2015, 11:32:27 PM

Title: Holley choke covers
Post by: WT8095 on July 14, 2015, 11:32:27 PM
Ran across an obscure little tidbit I hadn't noticed before in the '68 shop manual. In the carb specs section it lists choke cover markings for Holley 4150-C carbs. The applications are as follows:

C8OF-C (390GT M/T) - "GT1"
C8OF-D (390GT A/T) - "GTA"
C8AF-AD (427 A/T) - "57M1"

No info on 428CJ covers - my manual was printed in Nov. 67.

I'm posting this because I could only find one indirect reference in another thread. Maybe this can serve as a one-stop reference for folks seeking this info in the future.

I checked my recently acquired C8OF-D carb, and it has the correct "GTA" cap. I have another one in storage that I haven't checked yet. I don't have any photos handy of my own covers, but I did find a "GTA" in an auction that I'm including below. Sorry, couldn't find pics of the other markings.
Title: Re: Holley choke covers
Post by: rodster on July 15, 2015, 11:17:09 PM
Good information!  Who would have thought to look in the shop manual!  ;) 

I questioned whether the 57 MI choke cover was correct on my 67

http://www.concoursmustang.com/forum/index.php?topic=9487.0

and it appears it is. I don't have a 67 shop manual yet to check.

I found the marking information you mentioned in the 66 shop manual too.
Title: Re: Holley choke covers
Post by: J_Speegle on July 15, 2015, 11:40:52 PM
The Shop manual Kind of goes along with TSB article #1449 that does mention a note about the "new" CJ carbs and choke caps


68 2 CJ carb     
C8OF-AA for Manual (w/ GT-1) choke housing
C8OF-AB w/ Auto (w/GT-A) housing


Also list a somewhat related note about the new blue- idle adjustment mixture caps


Title: Re: Holley choke covers
Post by: preaction on July 16, 2015, 05:06:31 PM
67 manual calls for C7OF-A, B, D, having 57MI and the C having a GT.
Title: Re: Holley choke covers
Post by: J_Speegle on July 16, 2015, 06:27:07 PM
Guess if we can get digital pictures or each type and cover up through 71 then we could put together an article for the site
Title: Re: Holley choke covers
Post by: WT8095 on July 16, 2015, 10:46:52 PM
Not sure how much this will help. It's from the '75 MPC. Looks like some of the ones we've talked about are not even listed. Perhaps there's better info in the '68 MPC? This may not be very accurate regarding original application, but it does give some service part numbers that may help in tracking down further leads.
Title: Re: Holley choke covers
Post by: rodster on July 16, 2015, 11:37:42 PM
Quote from: preaction on July 16, 2015, 05:06:31 PM
67 manual calls for C7OF-A, B, D, having 57MI and the C having a GT.

Thanks!