Originally Posted by VortechSS (Post 4214304)

I've spent a ton of time in the past couple months trying to figure out how to make this work.... I'm a HUGE GM guy and play with LS junk every day but it's hard to look past the HP/CID of the new Coyote 5.0s. They are mean for their size. Take that math and apply it to 400+ cube builds then add more efficiency with bigger cams and we're looking at 650-700hp NA (keyword: Reliable!!) SMALL BLOCKS!!! THEN add the boost! This is good stuff here, guys!

Originally Posted by Lake rat Skater (Post 4214327)

I would think a N/A ls crate motor with good heads like this could make 600 hp, Ilmor makes 570 with pretty standard LSX heads. Add some boost and you have 750 to 900 hp and mercury has a large void in that range.

Originally Posted by freshwaterfiend (Post 4214486)

The thing is that LS heads flow so well already, is it worth the expense and all the unique parts potentially breaking to have 4 valve heads?

I personally don't understand why Merc or Ilmor doesn't use an LSA crate and go from there like Seven marine did with their outboards - and look at the success they're having. It's ridiculous we can't get the same package in a sterndrive.

Originally Posted by caseyh (Post 4214543)

marine power has been building small block alum LS motors for years. 500hp/550tq. they have a contract with one of the tow boats and its a awesome package. there is a 96 35' executioner getting them right now. still getting the setup right but was over 1.5mpg!

Motor is a stock cady cts motor with a blower!