I have a 29 scarab 1996 single screw.
I have 470hp.
Bravo I with 1.5:1 gears
running a 23 mirage plus at 4900rpm 61 on gps wot
what can I do to get more top end

At what RPM is the 470 HP produced?

What size motor do you have?

Julie

I haven't had it on the dyno yet just got the boat.
It is a 502 block.
All custom made. 850 holley,edelbroack square intakes, aluminum crane roller rockers, alm. covers and CMI elbow exhaust. I am estimating the 470 could be more or LESS! I wasa told it has a stock 502 cam?????

We will need to know were the peak HP is produced to prop you correctly. Either by Dyno or an expert guestimation.

Julie

OK I will get back to you with that info.
thanks
Bill

Your engine configuration tells us your more than likely low on your current WOT. If you can't get the exact dyno sheet, I would prop the boat in the low 5000's.

Lab Finishing your current propeller will get you there.

I met a guy two weekends ago with a 1994 29 with a 502/502 GM crate motor that ran 67 on the GPS if that helps(so he said). I was under the impression that a single engine 29 scarab would run 64-65 stock. Something does not seem right in your numbers. I wounder if the tac is right. Also are these fully trimmed numbers? Mine requires a ton of trim for top speed but I also have twin 350's.