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#476262 - 01/13/12 09:33 AM Re: 1969 427 "512" Block Question [Re: Stefano]
bergy Offline


Registered: 02/25/05
Posts: 1290
Loc: Pennsylvania, Florida
If my memory is correct, the location of the date tags were changed in late February thru March of 1969. They were changed simply because date tag charactors wouldn't draw properly from that angled surface. Thus, the date charactors on the early castings were often hard to read. Also, the cope (top) mold machine operator had to index his pattern out of the machine once per hour to change the time clock - so he could better clean/monitor the date tag condition. It was a running change on the patterns. The muller on the MIV block line was the oldest and least efficient ( I believe that it was made by Baker Perkins) of the 8 sand mullers (the rest were all Simpson mullers). Thus casting finish on the BB blocks was never great.

#476276 - 01/13/12 11:29 AM Re: 1969 427 "512" Block Question [Re: bergy]
paceme Online


Registered: 08/23/00
Posts: 2136
Loc: Long Island, NY
I don't have a definitive date but late Feb is when I believe the casting date switched from the side to the top. I think the earliest pic I have with date on top is C 5 9.
Steve Shauger
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#476287 - 01/13/12 12:43 PM Re: 1969 427 "512" Block Question [Re: paceme]
Stefano Offline

Carpal Tunnel

Registered: 10/06/01
Posts: 7096
Loc: Land of Lincoln
Thanks for the info, guys.

Since there were more 427 Corvettes than Camaros, does the NCRS keep any of this data?

Does anyone have a January or earlier cast block with the date on the top?
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#476304 - 01/13/12 02:15 PM Re: 1969 427 "512" Block Question [Re: Stefano]
Carleen Online


Registered: 08/11/07
Posts: 313
Loc: Sweden
I was looking at the block at ebay and the earliest block that has Casting in the rear that I found was a C 5 9 Casting.

Edited by Carleen (01/13/12 02:16 PM)

#476315 - 01/13/12 03:23 PM Re: 1969 427 "512" Block Question [Re: Stefano]
SuperNovaSS Offline

Carpal Tunnel

Registered: 09/10/01
Posts: 4547
Loc: Santa Cruz, CA
B 5 9 on the side:

#476316 - 01/13/12 03:27 PM Re: 1969 427 "512" Block Question [Re: SuperNovaSS]
black69 Offline

old hand

Registered: 01/08/07
Posts: 951
Loc: IL
I have seen more than a few 396 L78 blocks with A 69 codes on top side (old shortblocks, never rebuilt). I know where the engines are, but never took pictures. The dates were later in january (I think one was 22-24 ish)
I see no reason why a 512 block would be any different.

Edited by black69 (01/13/12 03:38 PM)

#476403 - 01/14/12 12:01 PM Re: 1969 427 "512" Block Question [Re: Stefano]
Unreal Offline
old hand

Registered: 05/15/00
Posts: 1054
Loc: Chattanooga, TN, USA
Bergy, you must be an old foundryman!

Reminds me of the story of an old foundryman who, every morning, would unlock his top drawer, look at a piece of paper, and then return it to the drawer and re-lock it. His colleagues would ask him what was on the paper, but he refused to tell. This went on for years and years. Well, unfortunately, he died one weekend, and a few weeks later when his replacement moved into the his old office, the new guy pried open the drawer, and found the note, which read, "Cope is the top, Drag is the bottom."

#476419 - 01/14/12 03:11 PM Re: 1969 427 "512" Block Question [Re: Unreal]
Dicky Offline


Registered: 12/24/08
Posts: 666
haha haha haha

#476423 - 01/14/12 04:54 PM Re: 1969 427 "512" Block Question [Re: Stefano]
bergy Offline


Registered: 02/25/05
Posts: 1290
Loc: Pennsylvania, Florida
Good one Gary! Notice how difficult it is to read the date on the picture that Jason posted above? That's why the date tag was moved to the TOP pattern!

#476833 - 01/17/12 10:14 PM Re: 1969 427 "512" Block Question [Re: Stefano]
6pakdave Offline

Registered: 12/10/11
Posts: 173
Loc: Gold Coast Qld Australia
This was in a 70 SS Chevelle I bought. Was claimed to be a LS5 warrenty engine, I think it was an early 1970 date code , if I recall the car was a late 69 build.

cheers Dave

You wanna get outta talk to me!

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