excalibur82

I'm sure there is a thread on this but ,I just did the top ends on my boat. I went from totally stock 454's including exhaust and did heads ,cams ,intakes ,carbs and exhaust .I did a small roller 575/575 lift any way I'm guessing close to 500 hp. What speed should I be seeing with this hp? Thanks Robert

green lightning

How fast did it go before you did the top ends and what were the rpm's at ?

excalibur82

I was seeing in the summer like 68/69 at 4800 26 bravo ones
depending on how many people.

682gold

iTrader: (3)

Assuming you have 1:50 gears that's about 13% slip. Try to get the engines spinning 5200-5300. Might have to go to a 25 and you could see 72ish possibly. Then again its a lot of trial and error to see what pushes your boat the best. I think I tried 5 sets before I settled on some.

excalibur82

That's what it did with the old engines . I'm hoping mid to high 70's with new set up. Just curious what 500 hp should do in it.

green lightning

With the right props I think it might go mid 70's , when I was making 625 mine would run right around 80 fresh water slight chop

green lightning

A friend of mine had a single step 35 with hp 500's and it went 77 on gps

barron

92 35' with healthy 525's touch over 80 with lite a lite load

IndyRacer

What kind of drives & props?

barron

Bravo drives turning in don't remember prop's it' been a while and 3 other boats.