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View Full Version : Sparks Plugs for 2003 MCX 350


kylegansel
04-09-2011, 10:40 AM
I have 2003 Mastercraft with a 350 MCX Engine. It is my understanding that the AC 41-932 Spark Plugs for this engine have been upgraded to AC 41-101 Spark Plugs. Both being of a platinum type also. Is there a difference between using the platinum or the iridium?

1redTA
04-09-2011, 10:46 AM
I would use denso TR-55 plugs, they run awesome in GM motors and are CHEAP

Jim@BAWS
04-09-2011, 01:17 PM
AUTO LITE 30s

Engine Nut
04-09-2011, 01:48 PM
I have 2003 Mastercraft with a 350 MCX Engine. It is my understanding that the AC 41-932 Spark Plugs for this engine have been upgraded to AC 41-101 Spark Plugs. Both being of a platinum type also. Is there a difference between using the platinum or the iridium?

Actually, in that pre-cat engine.I would not use platinum or iridium plugs.I would use regular AC Delco MR43LTS gapped at .045". Platinum and iridium plugs like to run hot and lean. Relatively speaking, that engine runs cold and rich. You are going to get lots of conflicting answers but this is the recommendation I make to anyone that asks. The reason that engine came with 41-932 plugs in it is because that what GM put in it at their factory but we used MR43LTS in those non-cat engines for years with great results.

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