1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year > 1970 Mustang

70 MACH1 Engine Bay & Engine Questions

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J_Speegle:

--- Quote from: Blown351stang on June 19, 2017, 09:30:27 AM ---Just a question on engine block cast dates.

My Cleveland block in the mach1 ......................................

The car was built 11/26/69 .............

 I have found two blocks
1 being a DOAE-J cast date 9K3 (69/10/3) .....
the other being a DOAE-J cast date 9L6 (69/11/6)

I am just not sure which one if any would suit my car the 9L6 sounds closer to the other parts. The intake manifold has 9L4 (69/11/4), The heads are 9K30 (69/10/30) & 9L3 (69/11/3), And exhaust manifolds 9K26 (69/10/26) & 9K30 (69/10/30).

What would the time be from casting engine blocks to having them ready and putting them into the cars?

--- End quote ---

Though its not written I assume that you believe that the intake and other cast parts are from your original engine. The latest date on the appears to be the Nov 4th intake date

Looking at the examples of data from other 70 Dearborn examples I see spreads between the block and the intake and heads of 3 - approx 30 days as typical. For this reason I would choose the earlier 9K3 block

Now at the same time we are missing a more important date to double check and compare to the 11/26/69  build date you provided for the completed car and that is the assembly date on the block for the completed engine since if that date on this particular block is after the Nov 26 it would then not be a good candidate IMHO

Hope this helps

Blown351stang:

--- Quote from: J_Speegle on June 19, 2017, 02:06:00 PM ---
Looking at the examples of data from other 70 Dearborn examples I see spreads between the block and the intake and heads of 3 - approx 30 days as typical. For this reason I would choose the earlier 9K3 block


--- End quote ---

Thanks for your input Jeff.

I guess 9K3 would make a bit more sense by the time it's casted ,cooled, cleaned then all the machining work done and ready to be assembled the 9L6 could be to close to the build date.

I am not to sure if the other cast parts are off the original engine just that they are much earlier then when the car was built.

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