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Cadillac 365 casting number ?

Started by 1939taka, September 13, 2023, 06:27:03 PM

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1939taka

I'm having trouble figuring out what year the engine is.
I don't know the displacement either.
Can someone tell me?
Casting number is 1456291.
There is a stamp 9R13142 behind the cylinder block on the driver's side.
There is no stamp on the front boss.
The crankshaft number is 1455101.

Comes with a high compression piston.
The cylinder head appears to be from a 1963 390.
Is this the old hop-up method?

From Japan.
Thank you.