[adam15425]

why are there different tooth flexplates for a internally balanced SB 350?

 

[Siggy_Freud]

I dont exaclty know why chevy made two different ones however I know they use two different starters that have two different mount patterns on the block. One is a 168 tooth and the other is a 153 I believe.

It would be interesting to know originally why they were designed like this.

 

[GoneNova/406]

the bigger one acts as a high tork starter.it simply gives your starter a bigger boost.we didn't used to have the tork in our starters that we have now and back in the day we used to have stronger engines.