I think it is the same as the LSA in the Cadillac, IIRC. I had the GM Catalog in the shop for a while, lots of engines and fuel delivery options. The 557 at its core is a GM crate engine
From wherever it is born 3 had ought to push the boat nicely.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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