Tinkerer

We can't help You if You won't help us with the info we ask for.

endeavour32

iTrader: (4)

You also need to make sure your carb is opening all the way. This should have been one of the first things that you did with a fresh engine install. This takes but two minutes to do, so go do it and report back.

Sunrocket24

iTrader: (1)

I over looked that in my first post. That has to be part of the problem. 50cfm is not the big problem its the fuel. I have that carb on my mild 468 with a 110gph fuel pump. Out of the box that carb ran lean on my engine and we had to put in the biggest jets that Edelbrock makes so it would not run lean. With those jets it was just enough fuel to run the engine safely and not lean. I'm sure his engine is more thirsty than mine.

endeavour32

iTrader: (4)

A merc 502 with 425 hp runs the same carb and so does the 454 and both push the boat well over 52 mph. There is a report posted on this boat in the general question section and with a stock 454 Mag the boat would radar at 60 MPH. There was one guy that claimed his boat hit 72 on the GPS but I don't believe it, I'm going to believe the magazine article. So with that said 52 mph would be right around 270 hp. The stock prop was a 23 laser II, so a 23 4 blade is two much. He needs to either run a 21 blade or a 23 3 blade and then see where he is at. Then yes- he needs a holley 800 cfm carb. Seeing that a car guy built this, I'm betting we are going to see that it has a cam that produces power past 6000 rpms. This would also add to the problem. Then on top of that I'm willing to bet its running the stock exhaust. The exhaust, prop, and carb might be good for an 80+ hp drop but I think the biggest problem is going to be the cam that was installed. However these are all guesses until we get the engine specs. With 525 hp this boat should be right around 70-72 mph.

Sunrocket24

iTrader: (1)

Good point on the cam rpm, really need those cam specs.

baditude

My senza spectre always ran best with a 3 blade but i was also running 425 hp small block and a alpha when it would hold together boat ran mid 70s

senza

adding my 2 cents worth, had a senza back in the day, 454 525 hp, bravo 1, 1.5 gears, labbed 26 mirage, 4800 at 78 mph gps, a little dicey on the turns that big step would really hook but it flewww.

sinus

And zero slip?

Uncle Dave

riiiight........

doesn't quite compute does it?

UD

nailit

1.36?? Would still be low at 10%??