Spark plug suitability Post Posted 05 June 2012, 11:34 AM #1201930 (In Topic #143625) Niels Settling In Spark plug suitability HiI have a set of Bosch super 4s 503 WR78 that I got for another vehicle. Are they suitable for use in a DX engine?CheersJon 0 guests and 0 members have just viewed this: None. Forum home Engines Big Block Injection Engines
