How can you tell if you have a 355 or stroker motor

[rsrsfishslayers]

Just wanted to know if there is anyway to check a motor. I have two guys that have two motors. One I was told is a sbc 355 and the other is a 383 stroker. My question is can you look at the motor and tell if the motors are what they say they are.
Thank you.
CPT.RON

[sds10racer]

usually you compare the harmonic balancer if they are stock balancers. the 383 will have the 400 balancer that has a long low part in it. the 355 one will be round all the way around.

[lookingaround]

if its been balanced you want be able to tell that way will you?

[sds10racer]

only if it's been internally balanced on the 383. if it has an after market or sfi balancer you won't either.