Delco 4 Cylinder Spark Plug Wire Set | United Ignition Wire 106 8mm ignition wire set fits GM 3.7L marine engines with Delco conventional ignition distributors. 3.7L Delco conventional ignition marine spark plug wire set For Mercruiser 165, 170, 180, 190, 470, 485, 488, and 3.7LX model 4 cylinder engines used from 1976-89 with Delco conventional ignition distributors 8mm blue SSC 100% Silicone wire for ultra low resistance of 270 Ohms per foot Carbon-latex coating for superior EMI/RFI suppression Heavy duty booting used to maintain dielectric properties Stainless steel and brass terminals for longevity and superior conductivity Straight 180 degree boots on distributor end 135 degree boots on spark plug ends Replaces Mercury 84-43376A6, 84-813720A6, 84-816761A6, & 84-816761Q6