My Moomba Mobius 2000 V has an Indmar Assault 5.7 MPFI engine.

I want to change the spark plugs this weekend as part of my winterization service.

The owners manual says the gap is 0.060"

Other boat forums state 0.045" gap.

Which is correct?

The O.E.M. plug is a AC Delco MR43LTS.

I have got 2 replacement types in my box to use....

NGK V-POWER TR5 (223 from SKIDIM (gap is preset at 0.050")

NGK LASER PLATINUM PTR5D-13(6644) from my dealer. (gap is preset at 0.040" )

Am i supposed to set the gap myself or use the default gap on the plug?

Some plugs are ruined if you change the gap (the platinum for instance)

Any ideas?