Hi i got a 1989 scarab 28 excel

Engine
502 cid with a holly 750 carb bravo 1 drive with an external extention
Prop is at the moment bravo 1 4 blade 24 pitch but im finding it to big.
The boat is making around 50 mph.

It even got one layer of anti fouling

Do someone know what proper prop i need for my boat cause i cant fit any 3 bladed cause the stern drive is to high
And it catches alot of air and the boat want even move


Any help please ???????

How many RPM are you turning at 50?

Arond 4600 with high trim

Is it a stock 415HP 502? Seems about right. Might try a 22 to get the revs up a bit, but I would guess you will only see a few MPH on the top end.

Yes its a stock engine

I had a 454 with the same carb it was a 380 magnum and use to do 54/55 with the same prop i made the 502 its a bigger engine and im doung less speed thats my headache

my buddy has one w/496 b1. he is seeing 50-54. running a 23p b1 @4600

So do you think thats the average speed of those boats im seeing it slow.
For 50 mph

You have bottom paint on it which is slowing you down quite a bit.... get rid of the bottom paint and you will probably pick up a considerable amount. I had minor calcium build up from some sort of shelled thing that was left on my boat when I bought it. Once I acid washed all of that stuff off (which wasn't a lot) it picked up well over 5 MPH.

Wow thats gd i will spray the bottom part next year cause i made the paint
Cause i leave it 3 months in the sea and to keep it clean its abit of a hassle

I have the same boat. Stock 454 Magnum 365hp no bottom paint 21p Mirage. 51mph @ 5200rpm