QA1 Pro Touring Upper Control Arms - Black - GM G-Body 1978-88 21411407 ApprovedAdvance plate and weights are

QA1 Pro Touring Upper Control Arms Black GM G Body 1978 88 21411407 ApprovedAdvance plate and weights are ApprovedAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionPolished steel shaft is QPQ coated and guided by sealed ball bearingsMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeVacuum advance canister for improved economy (can be locked out)Easy to adjust mechanical advance with supplied springs and stop bushingsPowerful built in module produces a 7 M & W Aluminum Products now manufactures a line of CNC component parts for sprint cars