looking for an extra 10 mph
 

which is the best way to obtain my goal?

boat: 2001 Checkmate Convincor 220, 350 Mag Mpi, 210 original hours, bravo 1, 22p 4 blade. would like to run 50-55 cruise and 70-75 WOT

would you tear down install a new cam and heads and exhaust?

put a Pro Charger on?

swap out for a big block?

or just sell and buy a different boat?

I have been in your shoes before and from what Ihave gone threw ,I would sell your boat and look for something else, you will be happy you went that way.

i think your way off on your numbers,,70-75 is way to fast for a single engine boat with a 300 hp 5.7 mpi small block..once you find out the true speed you will want to go 20 mph faster..you may want to find another boat that someone already poared money into..

thats the end goal, not saying that the 350 does that, just trying to see what i need to do to obtain that speed. one of the options i am thinking of is swapping to a big block and that is doable with a single big block for sure. my question is which would be the best route for me to reach this goal.

speed wax should be good for 7 or 9 mph

I have a friend that has a 216 convincor with a 385hp 454 mag and he runs a touch above 70. a stock 502 mag efi should put you where you want to be.

10 MPH is going to cost you some $, Sell boat and start over. JMO

My bad lol..just saw thease on facebook,,looks like a good deal..6500 fora complete hp500 less headers.. https://www.facebook.com/photo.php?f...type=1&theater

You will need at least an additional 150 hp to add 10 mph. While it is possible with the addition of a supercharger onto your existing engine, you can do it so much easier with a pullout BB. Your stock 350 Mag makes 325 hp. It will take almost 500 to reach your goal. We have done both Prochargers and Whipples on 350 Mags. While both kits have the ability to make near 500 hp, the Whipple kit is a much nicer piece. However, it does cost more.

A 502 Mag isn't going to get you where you want. You would either have to do some mods to it, or look for a 500 efi or a 525 efi. Either one will make the power that you want, but they won't come cheap. Bottom line is that you have to decide how much you like the boat. If you really like the boat and it's something that suits your boating needs, then go ahead and do what you need to do to make it run the speed you want. If you think you may want to step up in the near future to something larger, then just wait until you get the new boat since you won't get back the money you will spend on the engine swap/modifications.

What I'm trying to say is that it's a decision that only you can make, not anyone else. Do what you want to do. If you want to keep the boat, then by all means, go ahead and make it run. Good luck with whatever you decide.
Eddie

Sell it - Buy another boat that already goes the speed you want to run.

Its cheaper in the end.