Hot Rods 292 chevy flexplate

Is there any difference between a flexplate for small block Chevy and a 292 six,beside the bolt holes being bigger and more dowel holes?I got a small block flex plate drilled the holes larger and added a dowel hole.It makes deafening noise when I turn it over,put in 3 shims didn't help.

 

did you check the distance between the flexplate gear teeth, and the starter motor shaft? should be 1/8", you can measure it with a 1/8" drill rod or allen wrench.

they're all 168 tooth 14" diameter.

 

yes 292,s are xternely balanced ,like a 454 also have 1/2 inck crankholes

 

never seen one externally balanced, are you sure about that?

 

Internally balanced.