Nobody drive their boat at wot @ 5000 rpms for 400 hrs with 500EFIs. If they did, the 500 would probably be done for.

Don't even consider this comparison! Boat and car engines, as mentioned earlier, are two very different things in every way. 300-400 hrs is about the limit on any high performance motor of this kind. Some say 10x the hours, but it even be more. Mercs blue motors need rebuilds, as any other high perf. motor, that's how it is. Not exactly sure why you are asking this question? Nothing rude meant, just curious. If you want to go blue, it'll be something you'll need to put money into over time.

Good luck with the new boat:)

thanks for all the info. and the reason i am asking is because i am spending 55k on the boat now so i was hopein what i was hearing about the hours time frame was off a bit. i love the motors and dont mind getting it done was just hoping it wouldnt be in the first season with the boat.....

This would be my concern as well. And if you're going to go through the hassle of pulling the heads you might as well do a valve job. Then you'll be good for a long time.

they will go 500 hrs with nothing more then oil change.... at 500hrs you are on borrowed time

dose any one know what the top speed for a 33 ft with twin 500s would be.

x2

If compression is strong, I would run it through the summer and consider the top end rebuild a winter project. I ran my last 500 efi to 410 hrs with no problems. I don't run wot for more than a minute or two .

here i am with another question. the boat i am getting has the 500 efi's with bravo x drives. are those drives going to hold up or should i start saving for xr's?

Mid 70's on the speed. I have a Daytona edition with the extension boxes, and labbed props and the best I have seen is 82.

I would definitely be using the "top end needing refreshning" as a bargaining chip when negotiating price on this boat.