I can confirm that the 525 EFI is a drop in replacement for the 496. Getting your gauges to work is a problem though and exhaust holes will need to be relocated in the transom. The Bravo X upper will not live long per my personal experience.

Thank you. Dont think the 525 is going to get me big difference in speed tho.
496 - 425 hp at prop shaft.
525 - aprox 470 hp at prop shaft.

I think that 600hp and over is going to get me more difference in speed, but then I think that I must change my drive from bravo to IMCO

525EFI's are under rated on hp. They dyno at about 550-560hp at the crank so they are really more like 525hp at the prop.

Okey I read here on oso that it has like 470 at the prop on dyno.

Hp500 carb is 470 @prop

Interesting, but the Merc 540 Bulldog with procharger is more attractive than the HP500 or 525efi, if I compare prices. But the bravo X upper maybe dont like the power...

How does the instruments work for the Merc 540? I suspect that my Livorsi smartcraft doesnt work with that engine?

JohanSweden is there anything wrong with your 496 other then lack of power? I was wondering if it would be easier to super charge it and get you close to the numbers your looking for. Just a thought.

No more than lack of power what I know.
I have self thought about this. But many people have adviced me against it. Because supercharge a CBB Gen VII 496 is begging for problems, but thats just what I heard. I have no experience of it.
Theres so little price difference from my 496 to the 540 Bulldog. The money I spend on parts for the 496 is more than what I put extra money for the 540 .

So what did you decide?