How fast would a pair of 450hp 383's W/TRS move a 28?

I'll say 70

I would hope so, I am at 64 right now with 300hp per side

My 28 ran 71-75 with 475 hp 350's and Bravo's. Thats REAL speed, not downhill, no people, no fuel, no seats, +2-3mph......

64? my 28 with 300hp per side and bravos ran 67... is that on radar/gps? I thought my boat was set up pretty well, although I know we had some prop work to do...we were only running 4900 with 24" BravoI propellers. with 450 per side running through TRS and transmissions, I would say low 70's would be possible.

Sean, that was gps with trannies and TRS, not sure how much fuel I had.

Just trying to get an idea of what a pair of good strokers will do for me speedwise.

Sounds like Lake Speeds to me!!!
T/S 's 28with procharged 350's 475hp bravo's ran 73-74 tops, of couse we use GPS.
Rather know the truth than make bar stories.

I'm getting 71 MPH on the GPS in 1-2 foot chop at 5100 RPMS. The boat is dialed in perfect thanks to TS/Gun.

You would be hard pressed to get much over 70 IMHO. I'm spinning 24 Hydromotive 4 blades.

nick o teen, your running bravos and pro chargers right? how many horseys?

Yeah, it has bravo's and prochargers pushing out 475 HP per side. I love the procharger set up. The mid range power in the boat is spectacular.