Originally Posted by Pat McPherson (Post 2024213)

Well T, Dana is claiming +48HP for the 375HP 496Mag and +43HP for the 425HP 496MagHO on the dyno at Raylar...
http://www.offshoreonly.com/forums/s...d.php?t=150193

I changed to Stainless Marine manifolds from the cast iron exhaust on my 310HP/7.4MPI the second year I had my boat. I saw a 200rpm and 2mph increases with the same prop. That was probably 25-30HP. Your engine has better exhaust stock than that one did though.

Originally Posted by t-islands (Post 2024308)

Pat, you are always a wealth of good information.

Originally Posted by Superbabi (Post 2024351)

Yes he is, Pat is the OFFICAL, GO TO GUY !!!!!!!

Originally Posted by Pat McPherson (Post 2025344)

it is lots of fun to spend someone else's money...:D

Originally Posted by Pat McPherson (Post 2025532)

More info for you Gary...

http://www.offshoreonly.com/forums/s...d.php?t=151291

Originally Posted by Pat McPherson (Post 2024159)

We are never done looking for more speed...:D

IMO the first thing to do with your 496 is to modify or change your exhaust.
Talk to Raylar about the CNC porting program they have for your existing manifolds and the testing they have done with the new Dana exhaust for the 496 engines.
I believe that there is 30 to 50HP to be gain with exhaust mods/changes alone...:cool:

Raylar seems to be the best source for upgrades on the new 496cube engines.

Originally Posted by FX10 (Post 2025717)

Who's the guy up the Hudson who whippled his 496. Did 81 out of the box, and after dialing in does 84. Thats cool for a 496. And that motor has been running for a few years.

Originally Posted by FX10 (Post 2025945)

Gary, your right, it was Cary. Where is he ? Wish he was on here.