Decode engine ?

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indian

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I have what I believe is 1966 273 commando engine, tried running number on block it comes up 273 or 318. Block number is 2806030-1 number on the heads is 2658920-2. Thanks
 
Look on the front of the block, just under the head on the drivers side.

There is a stamping there with info.

Just an example.

Screenshot_20220131-210534.png
 
the CID will be cast into the side of the LA block, 318 next to the casting number, 273 wont have this. The heads numbers could cross to a 318 as they were pretty much the same.
20220131_204205.jpg
20220131_204105.jpg
 
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In 67 (maybe 68????) and older wasn't the 318 only a poly?
 
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