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Camaro Research Group Discussion => Decoding/Numbers => Topic started by: itsazooitellya on April 26, 2022, 10:06:13 PM

Title: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 26, 2022, 10:06:13 PM
Can anyone help me with these pad stampings? I included the block and head numbers although the heads are newer. It is "supposed" to be a Chevy 302 out of a 68 z-28. Is it? If not what the heck is it??

Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: x66 714 on April 26, 2022, 10:15:51 PM
124378N455370 was the car the 1968 302 was in. Engine was built in Flint June 10th 1968....Joe
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 26, 2022, 10:25:03 PM
Thank you, so the stamping looks legit?
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: cook_dw on April 26, 2022, 11:09:23 PM
Pad is good IMHO
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 26, 2022, 11:14:04 PM
👍
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: MO on April 27, 2022, 04:40:21 AM
Three months from casting to build?
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: cook_dw on April 27, 2022, 12:07:01 PM
Heads aren't correct.  I don't see anywhere that shows the block casting date?  My comment was strictly about the pad stamp.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 27, 2022, 12:43:06 PM
This it?
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: cook_dw on April 27, 2022, 12:57:11 PM
Yep and doesn't change my previous opinion on the stamp.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 27, 2022, 01:14:56 PM
Okay, thanks again
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: jdv69z on April 27, 2022, 02:38:52 PM
So is that block cast date E228?
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: cook_dw on April 27, 2022, 04:11:57 PM
That is what I am seeing.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: firstgenaddict on April 27, 2022, 08:24:27 PM
That is what I am seeing.
I see the same, which falls right in line with the Assembly date.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 28, 2022, 11:48:21 PM
UPDATE: After further inspection, the engine is sized, has mismatched pistons, and a crank with the number 3941174, 327? So now my question is what is just the block worth? It is currently still 4” bore. The windage is intact also. Trying to decide whether I walk away or not. Does seem like the block should be with something though. 🤷‍♂️
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: cook_dw on April 29, 2022, 12:00:55 AM
It’s only going to be worth the most to the person with the car.  Oddly enough I have another Z 1,000 vins off this one in my data.  Just the block can go anywhere from $1k-3k depending condition.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: bcmiller on April 29, 2022, 04:18:38 PM
Block is fine, 19 days from casting to assembly is not unusual.

Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: firstgenaddict on April 30, 2022, 06:28:16 PM
Std bore with no ridge which will clean up without oversized pistons would be the best case scenario.
N355370?
IS the car around?
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: ko-lek-tor on April 30, 2022, 06:40:52 PM
If it is seized because of rust, that may not hurt the value too much, will probably still need bored regardless. If it is seized because the block is cracked from freezing or something else, it could very expensive to fix, if it can be? Years ago, a buddy bought a 427 block at an auction. It looked good. After together and in the car, he started getting water in oil. It had a crack looking from underside, up in cam galley area. Maybe worth fixing today, but he junked it.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: firstgenaddict on April 30, 2022, 06:54:06 PM
If it is seized because of rust, that may not hurt the value too much, will probably still need bored regardless. If it is seized because the block is cracked from freezing or something else, it could very expensive to fix, if it can be? Years ago, a buddy bought a 427 block at an auction. It looked good. After together and in the car, he started getting water in oil. It had a crack looking from underside, up in cam galley area. Maybe worth fixing today, but he junked it.

I know of a 67 L71 engine which had MUCHO damage from a thrown rod, bottom of cylinder, pan rail(s) The owner took it to high end engine builder and told him if it took 3 years and 25k  he was ok with it... well 24 months and 12k later the block was solid and square without windows.
Canadian documented 67 L71 with N89 and N14, I figure 12k to keep the original block was money well spent.
Title: Re: Decoding a "68 z28 302" by the pad stamps?
Post by: itsazooitellya on April 30, 2022, 11:54:41 PM
Ok, thanks all!