Looking to validate a engine and rear axle stamps on 1969 Z28

Smartin72! · October 05, 2026, 04:06:14 PM

Hey everyone, my 69 Z28 based on the VIN (124379N616410) was built in March of 1969 at the Norwood, OH plant.

I believe the standard rear end was a 3:83 geared "BU" stamped rear axle, is that correct? I have the protect-o-plate (which as far as I know is real), has a BV0317G 3 stamped axle, which would indicate this was built with the 4:10:1 optioned 12 bolt rear end? Is that correct?

I also was looking to validate whether my DZ302 engine stamp which is V0306DZ is correct to the VIN?

Adding some photos, look forward to any help this group can provide. I am new to this, so still learning.

Thanks, Sean

boomer632 · October 05, 2026, 07:02:11 PM

BU is a 3.73 gear ratio. Your axle stamp looks authentic to me compared to many confirmed BU BV E axle stamps i have observed along with my own.

Smartin72! · October 06, 2026, 11:40:44 AM

Thanks, appreciate the feedback. How about the engine stamps??Any thoughts on those?

bcmiller · October 06, 2026, 11:43:43 AM

Please provide a clear picture of the engine pad stamping. From what I can see it might be OK.

Smartin72! · October 06, 2026, 11:54:02 AM

Not sure if this is any better??

FRANKTHECRANK · October 06, 2026, 01:51:29 PM

Why do those two stampings and the engine pad surfaces look so different if they are next to each other on the same engine pad?

x66 714 · October 06, 2026, 02:36:39 PM

Quote from: FRANKTHECRANK on October 06, 2026, 01:51:29 PMWhy do those two stampings and the engine pad surfaces look so different if they are next to each other on the same engine pad?

They're not on the same surface. The engine assm plant/date are on the top by the RH cyl head. The other is stamped into the raw casting down by the oil filter....Joe

bcmiller · October 06, 2026, 04:48:27 PM

Quote from: Smartin72! on October 06, 2026, 11:54:02 AMNot sure if this is any better??

Why are there diagonal lines across the photo? It is on the whole large size photo.

Smartin72! · October 06, 2026, 04:58:19 PM

Hi, yes, those diagonal lines are on the entire photo, not sure if it's picture quality or what. I have been trying to get better access to get some cleaner photos.

FRANKTHECRANK · October 07, 2026, 09:18:24 AM

Quote from: x66 714 on October 06, 2026, 02:36:39 PM
Quote from: FRANKTHECRANK on October 06, 2026, 01:51:29 PMWhy do those two stampings and the engine pad surfaces look so different if they are next to each other on the same engine pad?

They're not on the same surface. The engine assm plant/date are on the top by the RH cyl head. The other is stamped into the raw casting down by the oil filter....Joe

Ah yes, I didn't realize we were talking about a 69.

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Looking to validate a engine and rear axle stamps on 1969 Z28