NotRight,I'm seeing 80-81 gps in lake Ponchatrain.Chine walk can be an issue at times,gotta stay on top of it and turn "into" it rather aggressively to stop it.What I don't like is the "lean" to port after 70(prop tq)Thinking about a 1" shorty? My 548 is making 650 hp with efi. BOB

Anyone know what kind of speeds I cant expect out of a 270 with the 502 efi in it? Just got it and have not had it in water.... Cant wait til summer.

??????

I had imco single ram hydraulic steering on my silencer. Seemed to help a lot with handeling issues at speed. 454 mag mpi and the boat ran about 66-67. needs k planes to handle a little better. The bennets are worthless. 70 is realistic for a 502 boat with a labbed prop. I ran a 24 merc 4 blade.


raf

I had a 98 270 with a 454 mag, so 30 HP less than you are running. Ran about 61 0r 62, speedo showed higher, as they all do.

In flat water mine seems to get a little squirely at around 67-69. I have an add on single ram HD steering.

This winter I replaced my 12x12 Insta Tabs with 12x16 Insta Tabs, I am also redoing the gimbal ring, which had quite a bit of play in it. It should be much better.

I have a 97 454 mag 385 hp and it does 62 GPS and 67 speedo. Friend 's 502 is at 65 GPS 70 speedo

Speedos make you smile! Then ya gotta pay hundreds for a GPS only for the smile to go away? lol BOB

Speedos are the devils work!! They always lie

Bob, is that your boat in this months Hotboat? there is a write up on a poker run in New Orleans, one of the pics has a 280 Silencer in it.

Would that be the March issue? I noted there looked to be a 28 in the Powerboat issue last month at a poker run also.