uberstang1

I curently have a 1970 based 302 automatic. Im dropping in a 1989 based 302 manual motor in. Can i just replace the flywheel on the newer motor with the flexplate from the older motor, or will that throw off the balance of the crankshaft?

Five0hFox

nvm. miss read op

uberstang1

TTT. Anyone know?

Tony71502

Flywheels have a machined surface for the clutch to come in contact with. Flexplates do not.

Flexplates are only necessary to provide a bolting location for the torque converter and therefore do not have the smooth, machined surface.

AdderMk2

im pretty sure the older motor had a 28 oz imbalance. which means the flexplate you have would be incorrect. you need to buy one with a 50 oz imbalance

uberstang1

So do i also need a newer harmonic balancer? or can i use the 1970 balancer with a 50oz flexplate?

uberstang1

You must of misread my post, I know the difference between a flywheel and a flexplate. I was asking if my 1970 flexplate would be compatable with a 1989 harmonic balancer?

AdderMk2

again... if you have a 28oz imbalance flexplate it will not work with that motor. It has nothing to do with the HB. its the balance of the rotating assembly..

I already told you what to get

uberstang1

Ok I just wanted to check, a mechanic told me not to re use the older balancer/crank pulley. But as long as im fine swapping all my v-belt pullies over and the balancer over to the new motor with the new 50oz flexplate thats what im gonna do

AdderMk2

YOU CANNOT USE THE OLD BALANCER

YOU MUST USE THE BALANCER THAT IS ALREADY ON YOUR 89 MOTOR