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SD 4 Block Markings by Rugger
Started on: 03-18-2020 07:58 PM
Replies: 4 (103 views)
Last post by: edfiero on 03-19-2020 01:04 PM
Rugger
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From: Bay City, Michigan, USA
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Report this Post03-18-2020 07:58 PM Click Here to See the Profile for RuggerClick Here to visit Rugger's HomePageClick Here to Email RuggerSend a Private Message to RuggerEdit/Delete MessageReply w/QuoteDirect Link to This Post
I recently acquired a Pontiac SD4 block and 99% of everything else I need to assemble the engine.

Can anyone tell me the significance/meaning of the stamped "INDY 002" shown in the photo. I read that Indy #2 was donated to the Indianapolis Motor Speedway Museum, so I doubt this came from that vehicle!

How about the marking that resembles a clock. Is that identifying the time of day (0700) that the block was cast, or something else?

Any help with any of the markings would be appreciated!









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1984 Indy Fiero #458
1985 Fiero GT

[This message has been edited by Rugger (edited 03-18-2020).]

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fierosound
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Report this Post03-18-2020 10:14 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageClick Here to Email fierosoundSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yours says 2.5 SD on the side.
GM I4 PN 10027634 is the same number as mine.
It has E245 cast on this side near the top and "Super Duty" on both sides.



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[This message has been edited by fierosound (edited 03-19-2020).]

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Rugger
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Report this Post03-18-2020 11:12 PM Click Here to See the Profile for RuggerClick Here to visit Rugger's HomePageClick Here to Email RuggerSend a Private Message to RuggerEdit/Delete MessageReply w/QuoteDirect Link to This Post
Appears yours was built on May 24, 1985 if I read the date code correctly.
My date code seems to read M222 (too dark to go to the garage and look now...will try again tomorrow) which could be Dec 22, 1982 or Dec 22, 1992 (although usually the code was "L" for Dec. Pontiac did use "M" at least one year 1967, I think..)

But that stamped INDY 002 in the first photo is curious to me and seems to indicate earlier than 1992....

Hopefully someone can help decipher this mystery!

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1984 Indy Fiero #458
1985 Fiero GT

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wftb
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Report this Post03-19-2020 08:58 AM Click Here to See the Profile for wftbClick Here to Email wftbSend a Private Message to wftbEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have never seen a Super Duty block that did not have the words Super Duty cast in to it like Fierosound's block. The block in question has 2.5 SD cast in to it but it has the correct part # cast in to it. This suggests to me that it is a very early block. I do not know how to read the date codes though. I do know that the first run of super duty engine blocks were cast by John Deere, maybe they put a casting mark on there somewhere?

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edfiero
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Report this Post03-19-2020 01:04 PM Click Here to See the Profile for edfieroClick Here to Email edfieroSend a Private Message to edfieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
All SD blocks say 2.5 regardless of displacement, as the displacement 2.5, 2.7 etc is largely controlled by the crankshaft throw.

The INDY stamping appears to be done by the engine builder. That is not from the factory. Probably only Fred could comment on if the engines from the actual pace cars were stamped like that or not.

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