IMHO those Chevy guys don't know what they are talking about. 1975 was the first year GM used the HEI in Chevy sedans. That particular year of distributor had balance weight bushings which wore out quickly and affected timing. Also, some of the early modules were affected by heat I think. GM quickly remedied those ills and the HEI has an excellent reputation. 40,000 to 45,000 volts really makes a difference in the ability to fire a spark plug. And why else would a company like DUI adopt that design for an aftermarket line of distributors? Joe Fulton Salinas, CA _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list