Prestolite V8 Spark Plug Wire Set | Volvo 3857168 OEM 7mm ignition set for Volvo Penta GM 8 cylinder marine engines with Prestolite distributors. Volvo Penta GM V8 Prestolite marine spark plug wire set Fits Prestolite stack screw down cap distributors 135 degree boot at the spark plug end Original Volvo Penta Replaces Volvo Penta 876534, 3851821