NOT SHORE LORAZO BUILT MY MOTOR. 10 to 1 comp. 675 lift on the cam . dyno sheet i can not post picture here.http://www.youtube.com/watch?v=eL8i0Tnw7Qk 32degree timing . next run the timing was 34 . now i have it at 36 and i got a bigger carb 1050 dom

Type of dyno and more importantly, what is the correction factor set in the dyno that he uses?

Well my first experience was with a 600sc that even after having rebuilt both carbs and fu%#@king with both of them for hours on end ...on the water and on the hose, I could never get to idle decent or low enough.
Heres to my second carb boat experience being better.

Which is odd. The 600SC was supposed to be a very reliable and good running setup. Mercurys tune up spec called for 800RPM in gear idle speed. Same as the HP500 and other carb'ed high performance mercs.

This is where EFI has a advantage. You can have a 650RPM idle in neutral, and a 650RPM idle in gear. The IAC controls idle speed. Carbs, you just cant do it. The in gear idle will always be less than the in neutral idle. You just cant expect a big high performance carb'ed engine to idle at 600RPM.

A carb'd 1976 500CI Cadillac engine, sure. You can idle it down to 400RPM and it will still run. But a 190HP 500CI engine isn't gonna act the same as a 800HP 500CI engine. You cant expect it to.

I have a high performance boat. I grew up as a kid loving drag racing, loud engines, going fast and wrenching on my toys. I do it because I have a passion for it. If adjusting a carb screw, or idling 200rpm higher than my neighbors minivan bothers me, I need to get out of the hobby.My boat does transport my kids to school, I do not drive it cross country for business, it does not take me to the doctor for checkups. Its simply their to put a smile on my face when I lite the motors off, and go for a ride. If EFI makes you smile, by all means go for it.

I tune fuel injected motorcycles on my dyno on a daily basis and fully understand what it takes to tune one. That being said, I have a 750 rwhp twin turbo lightning (old 351 version) that I pulled the fuel injection off to try a blow thru carb setup. Reason is I get bored fast and I'm always doing something new with it and have grown sick of buying new injectors. I have at least 5 sets sitting in my shop. (19lbs, 24,30,42,72). Is that normal? Probably not. I know guys who built there hot rods 15 years ago and have done nothing, but change the oil since then. I can't do that. I am for ever changing stuff and just got sick of all the extra supporting equipment that changes on a fuel injected setup as you change or modify things. At least that's been my experience with my lighting that I've owned since 94' and had 3 different blowers, two different turbo setups I've built, two different nitrous setups, multiple head changes and who knows how many custom cams. I suppose I have a sickness and can't leave stuff alone. I'm not going to even mention bikes because its 5 times worse.

My current boat boat that I'm building I did pull the fuel injection off to build a carbed 509 for a couple reasons mentioned in this post. Since I can tune fuel injection I would want to try and tune the boat, but what I've read is that the mefi1 is not so great when it comes to tuning for many of the reasons listed in this thread. The thought of buying more fuel injection setups to replace the version I had wasn't even a thought. My last boat was a carb and in 150 hours (1.5 seasons) I never had a single issue related to the carb. If I have similar results with this new boat I will be more than happy.

On a personal level I think the mpi intake looks like poo and like the look of single plane intake and carb setup. That goes triple for a roots blower with carbs on top. I'm drawn to any and all roots blown cars at the shows like a bug to a bug zapper. Not sure why...probably the root to this sickness that I call my hobby.

I believe the new owner tried to adjust and gave up too, took it to a shop to have the carbs 'synced' and I think said it idles great now. I don`t know enough about carbs to like em, EFI is dummy proof, the PCM does all the work for you

Lol at those smilies.

The majority of 25 OL are beginner performance boat buyers.

When I was buying my 25OL.. I was definitly looking for reliability and ease of operation. My last boat was a carbed 350 and ran well.. still had to pump throttle at cold start but wanted to turn key and voila!

its like selling your house with a pool. You limit your demographics and it will affect price.

if your selling... stay with EFI!

EFI is dummy proof, only on a stock motor if you add more hp to your motor you have to charge alot and you have to have a a/f box and computer hook to your motor to reprogram the computer. how many guys no how to do that??????? i like efi only when you have a stock motor. like me i am always making more hp on my motor .so carb is for me. i got a m1 a/f box and dail my motor in and gain 2mph because i was to rich, went down two size on the jets

I have to agree there bob!