www.iFourWinns.com

So I'm changing spark plugs and the new ones match thread size and the threads are the same length, however where it sparks is 3/16" longer on the new ones. Is this ok? I'm guessing the old plugs are factory.
1988 four winns horizon 4.3 omc
Old plug ACMR43T
New plug RV15yc4

That is the correct Champion plug cross reference to the original AC Delco Marine plug, but I think I'd stick with the Delcos if you can easily get them.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

i would stay with the mr43t plugs I have the 5.7 with the same ac plug but the champion is a RV8C napa has the mr43t plugs

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1989 245 vista
5.7 cobra