SBC engine with last 4 casting numbers 9817

Rleis

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Nov 30, 2022
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1961 corvette
The engine in my corvette has the last 4 casting numbers 9817. I don't know if it's a 283 or 327, is there another way to identify the displacement, without pulling the heads?
 

63Half-ton461

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Nov 18, 2019
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1978 Monte Carlo 383 slammed
The harmonic balancer on a 283 is just a flange (pulley mount) where on the 327 it is a small damper.

If the motor original to the car u could check the build sheet , RPO numbers ....
 
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