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Old 10-15-2018, 11:43 PM   #1
1966burb
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1966 CHEVROLET suburban engine question

I want to verify the date on the engine block of the 327 that came out of my 1966 Suburban. Casting # on rear of block is 3858174. The other casting numbers I find are on the back of the block which would be under the flywheel. H5 174. Is this the date or do I need to look somewhere else for the date? Thanks, Jim
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Old 10-16-2018, 12:38 AM   #2
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Re: 1966 CHEVROLET suburban engine question

The casting date is cast into the block on the passenger side of the block, above where the flywheel is. It does consist of a letter which corresponds to the month of the year, then the day of the month and then the year as a single digit.
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Old 10-16-2018, 11:32 PM   #3
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Re: 1966 CHEVROLET suburban engine question

Here is a photo of the back of the block. Any ideas on date?
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Old 10-17-2018, 12:19 AM   #4
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Re: 1966 CHEVROLET suburban engine question

That looks like it is behind the flywheel.....I do not see any date code there. The date code is located where I previously said.

This is on a big block but a small block casting numbers and date codes are in the same location.

http://www.67-72chevytrucks.com/vboa...d.php?t=773368
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Old 10-17-2018, 01:20 AM   #5
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Re: 1966 CHEVROLET suburban engine question

just had to look in the correct spot and scrape off some grease to find it!
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Old 10-17-2018, 11:16 PM   #6
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Re: 1966 CHEVROLET suburban engine question

Does that say B 4 6 ? If so, the block was cast on February 4th 1966. The casting number does show to be a 1964-67 327. What is the stamping on the front pad?
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Old 10-18-2018, 10:02 AM   #7
1966burb
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Re: 1966 CHEVROLET suburban engine question

Yes B 4 6 . I will check stamped number on front.
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Old 10-21-2018, 10:31 AM   #8
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Re: 1966 CHEVROLET suburban engine question

stamping on front reads FO2O9YD
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Old 10-21-2018, 08:15 PM   #9
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Re: 1966 CHEVROLET suburban engine question

So far so good. Block cast on Feb 4, final assembly on Feb 9. At Flint Engine Plant on Bristol Road, which is gone now.
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Old 10-21-2018, 11:51 PM   #10
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Re: 1966 CHEVROLET suburban engine question

Here is the suffix code info.

http://www.nastyz28.com/gm-chevy-cod...-suffix-10.php
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Old 10-22-2018, 09:55 AM   #11
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Re: 1966 CHEVROLET suburban engine question

Thanks for all the information and help. Everything seems to line up good as original engine. J
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Old 10-24-2018, 12:34 PM   #12
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Re: 1966 CHEVROLET suburban engine question

Quote:
Originally Posted by Captainfab View Post
Here is the suffix code info.
So YD = Powerglide w/ A.I.R.

Your motor had A.I.R. (smog pump) ? Was it originally sold in California?
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Old 10-25-2018, 12:06 AM   #13
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Re: 1966 CHEVROLET suburban engine question

It does have the plugs in the exhaust manifolds where the A.I.R. system used to tie in.
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