Dear Dan;
I have sat through several "engineering" seminars over the years and most is what I call "techno-babble".
The relationship of the camshaft to the crank is the same weather stock or 'souped up'.
The main purpose of the (hi lift/long duration) cams is to get more air in and the exhaust out FASTER etc. The 'better' one can do this the more power you have.
So you can call it a pink elephant or anything, if it works good.
Greybeard is correct in that; 'hopping up' a marine engine is risky business.
Happy trails.
