383 which balancer ???? need help
 

OK a friend asked me a question i couldnt answer so here goes he bought a NEW 383 sbc rotationg assembly no bal or flexplate it has been internal bal becouse he paid 190.00 to have it done but the machine shop didnt tell him which balancer or flexplate to use 400 style or 350 style 400 being ext. 350 being internal i say 350 but im not real sure becouse of the 400 style crank any help so i can get him the answer so he can get the rest of his parts .. thanks i just didnt want to give him the wrong answer becouse i wasnt sure mike

If its int balanced get a int flexplate and balancer ATI Balancer is what I'd use

balancer
 

If it is internaly balanced you use the balancer for internal balance and the flywheel for internal balance.Do not use the external balance flywheel or balancer if it is internally balanced.Hope this helps.

When it was balanced it should have been done with the balancer and flywheel. Internally balanced, you won't want to use the external 400 stuff.

Why not call the shop and ask?
$190 would be an average price for conventional balancing. You would have to have just the right crank w heavy counter weights and a super light piston and rod assembly to not have heavy metal ($$)involved.

Dave Koehler
www.koehlerinjection.com

Internal balanced sbc is just like a 350 as far as balancer and flywheel.