Whats stock sparkplug in 33O merc ?

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03-04-2013, 08:48 PM

jason y

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Whats stock sparkplug in 33O merc ?

needing to buy plugs for my mild 454 figure good starting point be a stock 330 hp plug any one have a ngk number ?

03-06-2013, 01:25 PM

dbkski

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AC MR43T crosses to NGK BR6FS.

I use an NGK BPR6FS in my stock Merc 502 MPI. It just seems
to burn a bit cleaner. .035" - .040" for the gap.

03-06-2013, 02:13 PM

mr3dman

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unless it is a gen 6 with the vortec heads/ mpi then it is a MR43LTS NGK# BPR6EFS

03-08-2013, 08:09 AM

Knot 4 Me

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Quote:

Originally Posted by mr3dman

unless it is a gen 6 with the vortec heads/ mpi then it is a MR43LTS NGK# BPR6EFS

Yup. I had a 7.4 MPI that required the extended length plugs and someone before me had installed the shorter plugs. Amazed it ran as good as it did with the short plugs.

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