Like Bruce said pull the plugs and take a look. And yes you can
tell the difference through the spark plug hole,between a dished
piston and a flat top. dish=s 250 flat top=s 230. IF everything is stock. If the is a 250 and has been rebuilt IT could then have
flat top pistons.Many have done this to get more compreesion.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.