dumb question whats a notched transom?

Look at the pics in the first post. You will see the bottom of transom is stepped back from hull. That is the notch

What size turbos are those?

A lot. The ones with #6 drives are surfacing, heck for that matter they were raising the x dimension so high on most even some bravo boats come close to "surfacing".

I mean,t arneson .

That brings up the question, if the props are surfacing does it matter what kind of drive it is? Boat handling wise?

Anybody know?

Fountain installed Arneson way back when they made the 10M and 12M boats and there are a lot of the 42' with Arnesons and diesels, the 42' race boats of Fountain World Wide that dominated the European P1 course, Bill Mazzoni's 42' Fountain Taboo, the original Etore V hull was converted to Arneson in UK, the 38' race boat that Lil R raced was converted to Arnesons over in the UK, Sheds Plus, Tilted Kilt...

Enough successful applications? That covers 35' 38' & 42' race boats. The 10M and 12M as well as the 38, 42 and 48's came factory with Arnesons on them.

I'm glad Rik is fielding the arneson questions.

Joe,

They are based on Garret GT30 turbos.

Tell us more about the motors!

Haha, ok. They are 370CI with forged bottom ends and CNC ported heads, super alloy intake and inconnel exhaust valves. We are using the Holley hi-ram intake with our own intercooler that mounts between the upper and lower plenums. The turbos are internally gatted, and of course water jacketed. They build boost just off of idel just like supercharged motors. With regard to power output, they produce just under 900HP @ 6200 RPM on 87 octane. Not to bad considerng my target was only 800 for this set up.

This is the entry level motor out of a three motor offering that are rated at 800, 1100, and 1300HP.