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Canadian Poncho Homepage -> Canadian Poncho -> Hillar's General 65-70 Full Size Forum -> Decoding engine casting date...
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LT1Caddy


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Decoding engine casting date...
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Hi.. Looking for some help decoding a BB 454 engine, it's a replacement block. The casting date is J 23 74. Would that be November 23 1974?

 

Thx in advance



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65 SD L79


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October 23 1974



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4SPEED427


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And I would have said September 23 1974 because I thought they didn't use the letter "I" !

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65Camino


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Was thinking Sept as well. Skipping the I makes it the ninth month.

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LT1Caddy


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Hi.. That's good it's a 74. Was trying to determine some of the engine specs and was not sure of the year it was built



THX

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norontcan


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I also think September of 1974.
I was going to say it would have been in a 1975 model year but then saw you said it was a replacement block so who knows.

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65Camino


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Do you have just the block or is it more ?

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LT1Caddy


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I would think its a mostly complete short block, the HEI distributor is from a Corvette. So I'm thinking the compression ratio is around 9:1 so I can use regular (87) octane.

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North


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Interesting that chevy skipped I for September because Pontiac did not.

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73SC


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LT1Caddy wrote:


I would think its a mostly complete short block, the HEI distributor is from a Corvette. So I'm thinking the compression ratio is around 9:1 so I can use regular (87) octane.

 Just checked, its 8.25 to 1 for the LS4 in 1974 and was still spec'd to use 91 octane minimum.



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4SPEED427


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Odd. Why would they want 91 octane on an 8.25 to 1 compression?

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Could it be that 91 was unleaded while the others could be either ?

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