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1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1968 Mustang => Topic started by: 68GT/CSconvmod on April 11, 2019, 12:16:06 PM

Title: 428 C scratch or A
Post by: 68GT/CSconvmod on April 11, 2019, 12:16:06 PM

Have been told the C is not specific to CJ block I have one built 8B17 with C,  my 68 Shelby release date was 8B26 even though my car came with PI motor , is this considered period correct for my car?  Or do I need a A scratch in your eyes ?  I found a 7L28 block. What would you say is period correct?


Troy

Title: Re: 428 C scratch or A
Post by: Coralsnake on April 11, 2019, 03:48:57 PM

Unfortunately, I dont have a lot of examples of GT500 block dates.

There are several things I would do to try to determine if you Police Interceptor block is correct ...

What number is your car?

I can see if I have an example close to yours.

Have you found a serial number on the block, heads or intake?

Title: Re: 428 C scratch or A
Post by: 68GT/CSconvmod on April 11, 2019, 04:49:40 PM

Only block with mains , pistons, rods. Nothing else. No vin stamp.  Car 01923 , I have marti

Troy

Title: Re: 428 C scratch or A
Post by: 68GT/CSconvmod on April 11, 2019, 04:51:34 PM

I also found a 8A with A scratch block .030 bore.

Troy

Title: Re: 428 C scratch or A
Post by: rockhouse66 on April 11, 2019, 04:53:49 PM

Since you can't see the "A" or the "C" with the engine in the car, I would focus on getting the right date code for your build date.  Your 8B17 is too close IMO but that 7L seems pretty early.

Title: Re: 428 C scratch or A
Post by: Coralsnake on April 11, 2019, 07:19:27 PM

I have an example that is very close to # 1923, from that I would extrapolate that the car most likely had a block cast during the third week of January 1968.

I don't think it would be uncommon to find the PI block with a "C" scratch (after phoning a friend)

Title: Re: 428 C scratch or A
Post by: 68GT/CSconvmod on April 11, 2019, 08:32:49 PM

So the 8B17 C scratch that I have falls to close to date released. 8A15-21 area is the one I would need. Interesting, Thanks for the reply.


Troy

Title: Re: 428 C scratch or A
Post by: Coralsnake on April 12, 2019, 12:04:39 PM

That would be my best guess

Title: Re: 428 C scratch or A
Post by: RoyceP on April 13, 2019, 09:10:30 AM

That would be really unusual. I suggest that you examine the date code closely. I suspect that it may be a 6A date code that looks like 8A. It's easy to confuse the way Ford cast the 8 and 6. They can look the same.

The C scratch replaced the A scratch mark. It has nothing to do with the 428CJ. The same block was used on any / all 428's during any given period of time, regardless of whether it was a GT500, 428CJ, cop car, or granny's Park Lane station wagon.

Quote from: 68GT/CSconvmod on April 11, 2019, 04:51:34 PM

I also found a 8A with A scratch block .030 bore.

Troy