Volvo Penta Spark plugs

John41John41 Member Posts: 107 ✭✭
in General Boating Discussions
I plan on doing a tune up this season on my Volvo Penta 5.7 engines. I’ve purchased everything but the spark plugs. The price on the plugs at the store were 16 dollars each. Can anyone recommend a really good plug without the high price tag? 
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