just putting this back to the top

Sorry I was at the lake :)

Have you tried a smaller set of props to see if this is rpm related? Do you know anyone with a scanner?

They have tried smaller props they put on a pair of 24 4 blade props and it still climbed slowly in rpms not sure what it got up to in rpms but they said there is a problem. You can feel the boat fall forward when you get it up to speed around 70 mph and when you push the throttles past that point that when you feel the boat fall forward it like it looses some power I think it must be in the computer program thats the only thing I can come up with

I would have to agree. Mark did mine also and I did not have a problem but who knows.

New heads you said ? What kind ?

Different valves you said ? What length ?

What springs ? What installed height ? (thus length question also)

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Are motors grounded properly to batteries ? Any grounds not reinstalled during engine builds ?

Voltage proper to ignition coil and ECU ? Does voltage drop at all on your gauge at this suspect rpm ?

Did you verify SC belt tension ?

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Bravo Drives I expect ? What mph are you at when tach is at this rpm fuss point ?

I took of the stock vortec heads and had the same size heads made they are vortec heads with stainlees steel intake valves and inconel exhaust valves as far as the size they are the same heads with upgraded valves as far as lenghts I do not know I didi not do the build my old shop did the build and also will never touch my boat again because of some thing they did Super charger belt is tight