The Pro-Billet distributor line debuted in the late-'80s. It generally consists of a housing that's CNC-machined from billet aluminum, a coated main shaft that rides on upper and lower roller bearings ...

OptiSpark. The name alone is enough to give '92-'96 Vette owners the jimjams and send even the most jaded auto techs scurrying for their shop manuals. Indeed, with the possible exception of the ...