can any tell me what speeds and props these boats run with twin 454 mags.?

72-74mph,probrably has 28 Bravos

and have the 454mpi motors and 28 pitch Bravo 1 four-blades and see about 68-69mph.

26sonic,

76.9 GPS with 30's Lab Fin. Birdog was along fopr the ride.

Only thing done to the 2000 454 mag's is LARGE air filters Eddie's

The 312 has a great ride!!!!

I'm told that my new "97" 312 will run an honest GPS 80 mph with it's 454 EFI's.....of course there are the Prochargers helping out just a bit! I have to wait for delivery on April 19 to find out if it will run that fast or what in Oklahoma air.....the boat comes from Scottsdale Az. I think that is a higher altitude, but could be wrong. Here's hoping!!

Our 97 with Prochargers/454 Mag efi's will run an honest 85 here in Alabama.

magic float what pro charge units are you using? what size props and gear ratios? is the 1997 a step hull.

Low boost M-1's. Went from 1.65's to 1.50's. Lab 31's I believe, will have to check,the 97 was the first step 312

We have a 97 312 on our lake with 454 mag mpi's & whipples. Dave had 1:65 gears, can't remember if he went with 1:5's or 1:36 gears. His boat runs a solid 84 plus in our very humid and hot summers. This will be his 3rd summer with the whipples.


Jan

Jan,

I have 1.36 gears.

Dave