My only concern using the SB400 is the effect of salt water in and around the siamesed area of the block.. Then what heads/piston combo? Are you gonna try and stuff a long rod in or go back stock? Don't forget the steam holes, there won't be any in a new set of heads.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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