The newer 250 engines have a 2 groove damper,then you can bolt on your 1 steel pulley. Then you will have 3 total.
The newer 250 1975 IIRC & newer,the v-groove spacing is wider than the older 250's.
So,,, Just order a new damper for say a 1970 Chevy Nova 250 6.
MBHD
