Originally Posted by Uncle Dave

hmmmmmm.......

It is great that we have a choice vs Merc, but not because Merc ever did anything wrong to me, just the opposite. I just like options. (we can also build custom at our price points)

Last rig I chose a 710 which was the latest bestest at the time, and I love my Ilmor plus Id add- ownership experience to date has been superb.

The 570 although bound to be a superb mill, it offers different choices.
In a 565 vs 570 round its harder for me to make the call.

Both Iron Block aluminum head engines. So right away its not as cool as it could theoretically be.
Which one could be bored stroked the most at rebuild?

Ones a BBC, the other an LSX.

BBC has tons pf parts, at very reasonable prices and rebuild costs, plus a plethora of options such as going back to a more reliable super high perf manifold.

LSX-a few and getting more, but its an answer to a non problem.

Whats the retail price of both engines?

Tough one here....

UD

Originally Posted by 4mulafastech

Something else to consider is the BBC does not incorporate variable valve timing technology like the LSx which increases low end torque and high rpm horsepower.

Originally Posted by Uncle Dave

True-it does not.

Let see what the two curves are though before we declare a winner.

If the 565 has an equal or better without curve without the VVT would it be "better"?

Still the thought of a twin re-power from a single 710 to twin 570's is a really cool proposition hmmmm.....

UD

Originally Posted by 4mulafastech

Yes, it would be interesting to see those curves laying on top of one another. Even so though, before declaring a winner we still should keep in mind the 570 is small and lighter, so for those boats that may have twin small blocks, going to twin big blocks is not a possibility. This can be a great alternative for us folks stuck with small blocks.

Originally Posted by C_Spray

ILMORdude - Correct me if I'm wrong, but the durability requirement during development was 24 hours at maximum load and wide-open throttle, right?

rlj676 - As fas as low-end torque goes, I believe I heard a spec of 400 lb-ft at 2500 rpm. Variable cam timing is a wonderful thing. Bear in mind, too, that you'll get an additional 15% torque gain because this engine can be geared shorter than a 5200 rpm engine, so it's equivalent to 460 lb-ft. That should do it. Since this is a derivative of the 522 hp skiboat engine, ILMOR has applied the low-end torque knowledge that they gained in that market.

The line of boatbuilders and engine importers was non-stop at ILMOR Saturday afternoon. The Mercury 565 is apparently not CE-approved for export to Europe...