EST Distributor Spark Plug Wire Set | Crusader 98171 Original Crusader 7mm ignition spark plug wires fit Crusader big block engines with Delco EST electronic ignition marine distributors. Crusader Delco EST big block engine spark plug wire set Fits Crusader V8 454 c.i.d. (7.4L) and 502 c.i.d. marine engines with Delco EST distributors For both standard and reverse rotation engines Straight spark plug boots to clear exhaust manifolds and 90 degree boots at distributor 7mm RFI suppression ignition cable Replaces Volvo 3857169