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  #11  
Old 01-13-2012, 02:33 PM
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bergy bergy is offline
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Default Re: 1969 427 "512" Block Question

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.
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Old 01-13-2012, 04:29 PM
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Default Re: 1969 427 "512" Block Question

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.
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Old 01-13-2012, 05:43 PM
Stefano Stefano is offline
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Default Re: 1969 427 "512" Block Question

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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Old 01-13-2012, 07:15 PM
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Default Re: 1969 427 "512" Block Question

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.


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Old 01-13-2012, 08:23 PM
SuperNovaSS SuperNovaSS is offline
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Default Re: 1969 427 "512" Block Question

B 5 9 on the side:


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Old 01-13-2012, 08:27 PM
black69 black69 is offline
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Default Re: 1969 427 "512" Block Question

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.
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Old 01-14-2012, 05:01 PM
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Default Re: 1969 427 "512" Block Question

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."
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Old 01-14-2012, 08:11 PM
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Default Re: 1969 427 "512" Block Question

[img]<<GRAEMLIN_URL>>/haha.gif[/img] [img]<<GRAEMLIN_URL>>/haha.gif[/img] [img]<<GRAEMLIN_URL>>/haha.gif[/img]
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Old 01-14-2012, 09:54 PM
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Default Re: 1969 427 "512" Block Question

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!
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  #20  
Old 01-18-2012, 03:14 AM
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Default Re: 1969 427 "512" Block Question

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


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