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Author Topic: 1969 z28 flywheel  (Read 3686 times)
69er
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« on: October 22, 2007, 11:44:50 PM »

In comparison to other engine part date codes, where should the date code be
for a 1969 z28 flywheel.

For, example should the date code of the flywheel be before the engine casting date code?

How far ahead should this date code be. For example, if your engine has a March cast code
what should the cast date code be for the flywheel for it to be a matching part?

thanks I hope I was clear.

69er
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JohnZ
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« Reply #1 on: October 23, 2007, 10:18:39 AM »

The casting date for the flywheel must be at least a day or two prior to the stamped engine assembly date on the front pad; it was cast at Saginaw (with all the other engine castings) and machined and installed on the engine at Flint V-8.
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'69 Z/28
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69er
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« Reply #2 on: October 24, 2007, 09:10:19 PM »

What about CE blocks did they get flywheels installed?

69er
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69er
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« Reply #3 on: October 24, 2007, 09:52:08 PM »

John Z,

I was just looking at Jerry's website. He has some facts on an original unmolested 1967 z28. The engine data is as follows:
3914678 CASTING DATE J97, ASSM DATE V1121MO. The flywheel data is as follows: 3791021, DATED K157.
If I read this correctly the flywheel was cast a little over a month before the engine date stamp on the engine pad.

So, could some flywheels be original to the car but yet be cast up to a month earlier than the engine stamping date.

Maybe it was different in 1967.

what do you think?

69er


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1968RSZ28
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« Reply #4 on: October 24, 2007, 11:56:48 PM »

I was just looking at Jerry's website. He has some facts on an original unmolested 1967 z28. The engine data is as follows:
3914678 CASTING DATE J97, ASSM DATE V1121MO. The flywheel data is as follows: 3791021, DATED K157.
If I read this correctly the flywheel was cast a little over a month before the engine date stamp on the engine pad.

So, could some flywheels be original to the car but yet be cast up to a month earlier than the engine stamping date.

69er -

The engine assembly date is November 21, 1967 and the flywheel cast date is November 15, 1967.  The flywheel was cast six days before the engine was assembled.    Smiley

Paul
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JohnZ
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« Reply #5 on: October 25, 2007, 09:41:21 AM »

What about CE blocks did they get flywheels installed?

69er

Nope. "CE" blocks were either "short blocks" (block, crank, rods, ringed pistons) or "fitted blocks" (block & ringed pistons, no crank or rods); all other bolt-on parts were to be transferred from the failed engine.
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'69 Z/28
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69er
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« Reply #6 on: October 25, 2007, 02:50:43 PM »

My apologies Paul, I was looking at the engine casting date compared to the assembly date. That span of time
is a little over a month.

Thanks for your input.

So, the casting date of the flywheel compared to the engine assembly
date can be cast at least 6 days ahead. I'm sure their may be other examples
where the casting date of the flywheel could be more or less.

Thanks again.


69er
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69er
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« Reply #7 on: October 25, 2007, 10:38:34 PM »

I think that it's very interesting that the 67Z has the distributor and starter dated
about three months ahead of the engine build date.

I hope I got the math correct on that this time.

Are those acceptable time frames for those components?

69er
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fireZ
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« Reply #8 on: October 26, 2007, 09:44:53 AM »

i had a Grandfather work at Oshawa for G.M. in the 60s and he has often talked about parts coming in and being put in front of parts that had already been at the plant for 1 or 2 months. I really do think it is hard to say everything is this amount of days or this amount of weeks before assembly. I do agree that all parts had to be dated before the engine assembly but as for the rest who knows but the guy grabbing the parts from the bins. I wish he was still around as he put 39 years in at Oshawa and used to share many stories about parts and pieces being found after some models had come and gone.








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1968 Z28 LA Built
LIC # RPO Z28
JohnZ
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« Reply #9 on: October 26, 2007, 06:16:47 PM »

i had a Grandfather work at Oshawa for G.M. in the 60s and he has often talked about parts coming in and being put in front of parts that had already been at the plant for 1 or 2 months. I really do think it is hard to say everything is this amount of days or this amount of weeks before assembly. I do agree that all parts had to be dated before the engine assembly but as for the rest who knows but the guy grabbing the parts from the bins. I wish he was still around as he put 39 years in at Oshawa and used to share many stories about parts and pieces being found after some models had come and gone.

That's correct - inventory control in an assembly plant was pretty primitive in the 60's, and there was very little FIFO (first in, first out) emphasis; "do we have them" was the important phrase. That's why NCRS allows up to six months prior to the car's final assembly date for dated components in Corvette judging.
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fireZ
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« Reply #10 on: October 26, 2007, 07:51:52 PM »

Thanks John I have been telling guys the same thing for years. I wish my grandfather was still around and I could bring him along and explain G.M.s inventory control system in the 60s.
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1968 Z28 LA Built
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