Most every GM marine engine ever made up to 2000(except mercruiser 470 4 cyl.)uses these spark plugs. Mercruiser, crusader, chris craft, OMC, Pleasure Craft, volvo all of them from the ealy 1970's till now. Simply remove one and look at the number on it. The AC number is MR43T. The Champion number that crosses directly is RV8C. These are marine plugs not automotive. Compare price around 4.00 a plug. Get them while I have them!!! Sold individually. We also stock a large selection of other spark plugs from AC & NGK at low prices. Call for a quote.  FREE SHIPPING ON THIS PART NUMBER!!!!!!!!(quantities of 8 or more, within united states).  Large quantities(96) or more recieve an extra 10% off, call 419-625-0605 for this great price.  Please select part number from drop box.

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