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Engine build date

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Bandana View Drop Down
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    Posted: Feb/20/2018 at 1:54pm
Finally getting some numbers off my engine. 3196291C on the heads which I understand are the  good 1970 heads. The block has the "401" casting on the side and has the part number of 3198951 which from what I found is a 401 block from 1971 til 1978 .... Is there a way to narrow down the date the engine was put together - without a valve cover tag????


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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Feb/20/2018 at 9:12pm
Early 71 401s had the 6291 head castings.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bandana Quote  Post ReplyReply Direct Link To This Post Posted: Feb/23/2018 at 8:57am
Trouble is I don’t know if the heads are original to this engine...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Feb/23/2018 at 9:14am
And those early '71 heads could be 291I rather than 291C.

Heads and block should have a casting year with a small pointer, like on a dial. That helps show when those items were cast.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Feb/23/2018 at 12:28pm
Block casting date is in the lifter gallery.
Also the foundry ID as to where it was cast is there.

If it's a 70 through 76 it should be a CFD block.
CFD is GM. Yep, GM cast our beloved ramblers for a number of years.


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