Not enough speed

[bmadison31]

I have a 18.5 Nordic with Berkeley Jet. My best GPS speed is 78. I have done about everything I can think of. I figured my set up should run in the 90s. How can I get there. I am considering a cam change to a roller cam and need suggestions. Well heres my current list of wallet damaging parts.
460 ford block
4.140 scat stroker crank
JE flat top pistons
Ford Racing scj-a aluminum heads 2.25 intake 1.88 exhaust ported by Scott Johnson at Reincarnation
Offenhauser dual tunnel Ram. Holley 600 double pumpers
MSD ignition w/ start retard. No advance in distributor
Comp Cams 306s
Roller rocker arms 1.73 ratio
Berkeley jet has the following: place diverter, droop snoot, wedge, finger grate
I had the wear ring replaced and was told I had an A modified impeller (whatever that means) It is aluminum.
I have checked the bottom for a hook with a four foot flat edge.
Is it possible to get anymore out of this boat. I have been running 110race gas. I think my compression is 12.5:1
Please help

[b's sanger]

You may have to change to a B-cut impeller

[Squirtin Thunder]

What is a finger grate??? Do you mean rock grate? Or some sort of loader???
Jim

[bmadison31]

Desktop dyno puts me at 711 horse. I have no idea what the boat weighs.

[hack job]

my old spectra 19 would hit 90 with a b impellor and tons of pump mods and 735 hp . it was running a bbf 501 cid with about 10.2:1 compression. also it had 2 750 dp's on top of it i would imagine that the boat is capable of doing that speed but ask your self how much is it worth 78 is a pretty good speed you might also try talking to some one that might a know a little about those hulls and what it might take to push it up to that speed. good luck

[hack job]

Desktop dyno puts me at 711 horse. I have no idea what the boat weighs.
at what rpm is it making that hp?
also what rpm are you at , at top speed? this will help us tell you what kin of hp you are makeing

[bmadison31]

I did consider buying a couple 750 proform bodies for my carbs. I've been told I have enough carb. Haven't been able to locate anyone that knows anything about Nordic boats

[bmadison31]

I was running 6000 rpm. Desktop puts that at 695horse.

[Duane HTP]

Your impeller size and your RPM equate to way more than 78 mph. Something is wrong. Tell us a little bit about your set up, how it carries and so on.

[Squirtin Thunder]

Here is an old JPC check it out and play with it and you will learn more about your set-up.
Jim