Hey guys, I'm new to the site and looking for help on this. I have a 1972 351W I am stroking to a 408 for my 1968 Mustang GT. I don't know what balancer/flexplate combo to run. I think it is 28 oz. for both????? The motor has an Eagle forged crank, Probe SRS forged piston, MGP billet aluminum rods, Trick Flow main girdle, Arp main studs, Clevit 77 main and rod bearings. Also is the number of teeth on the Flexplate of much importance?? Thanks for your help.

 

the teeth in the flex plate have to match your starter... important...
my engine is balanced at 28 oz if that helps ya any...

 

28oz and 157tooth

 

thanks guys!! One more question. Why are some engines internally balanced and other externally??