Author Topic: 70 MACH1 Engine Bay & Engine Questions  (Read 3113 times)

Offline Blown351stang

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Re: 70 MACH1 Engine Bay Questions
« Reply #30 on: May 06, 2017, 05:56:21 AM »
What is the big blob's of sealant they put over the sheet metal joints and gaps or in corners?
Is it just like the rope caulking ? on my car after 48 years its gone hard and looks white or very light grey.





Offline J_Speegle

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Re: 70 MACH1 Engine Bay Questions
« Reply #31 on: May 06, 2017, 06:02:28 PM »
What is the big blob's of sealant they put over the sheet metal joints and gaps or in corners?
Is it just like the rope caulking ? on my car after 48 years its gone hard and looks white or very light grey.

Might be but think it is likely a similar product. Often the white we find in sealants and sound deadener is the asbestos aging, becoming visible and turning after all these years.
Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline specialed

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Re: 70 MACH1 Engine Bay Questions
« Reply #32 on: May 07, 2017, 01:50:12 AM »
good ?    someone needs to figure out exactly what that sealant is as it is used many places on the body joints& corners

Offline J_Speegle

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Re: 70 MACH1 Engine Bay Questions
« Reply #33 on: May 07, 2017, 04:59:02 AM »
good ?    someone needs to figure out exactly what that sealant is as it is used many places on the body joints& corners

Not sure if we need to figure out what was used or just what to use today to reproduce the look ;)  Hard to tell after all these years how flexible it was in the first year and details like that but it seems to have stayed where they put it, didn't level out like some of the other sealants/chalking and depending on year and application what colors were used when and where
Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline Blown351stang

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Re: 70 MACH1 Engine Bay & Engine Questions
« Reply #34 on: June 19, 2017, 09:30:27 AM »
Just a question on engine block cast dates.
My cleveland block in the mach1 has be changed at one time in its life with a DOAE-L cast date 0M16 (70/12/16) block which is to late for my car and now I am on the lookout for a closer to correct block for it.
The car was built 11/26/69 there is no engine build tag on it. I have found two blocks 1 being a DOAE-J cast date 9K3 (69/10/3) and 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?

Offline J_Speegle

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Re: 70 MACH1 Engine Bay & Engine Questions
« Reply #35 on: June 19, 2017, 02:06:00 PM »
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?

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
Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline Blown351stang

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Re: 70 MACH1 Engine Bay & Engine Questions
« Reply #36 on: June 20, 2017, 10:25:45 AM »

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


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.