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Old 02-06-2013, 07:42 PM's Avatar is online now
MC Maniac
Join Date: May 2010
Boat: 1989 MasterCraft TriStar 190 SE
Location: Houston, TX
Posts: 3,608
I haven't used seafoam as top end cleaner although I have used gm's top end cleaner, simply use a manifold vacuum source (like your pcv port) you will need to keep the revs up until all fluid has been consumed and it will very likely smoke. I haven't done a boat but have done many cars.

1989 MasterCraft TriStar 190 SE
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