Is there actually a physical differince in the SFI version vs. the regular one ? I understand they are certified for whatever RPMS and have an SFI number, but is the actual part the same and your just paying extra for the SFI certification or is it made differint ?
They are different. The SFI balancer has to have something to retain the weight other than the rubber. They are pressed together in a way that encapsulated the rubber so they can't fly apart. They also have more weight in the outer ring to absorb vibration at higher rpms.
on my bhj they do have the correct timing marks on it as the directions on here to mark for 26 degrees btdc. and i bought it at the beginning of this year.