But how much more Torque did you add to it?

Do you have cog or serpentine drive system? If serpentine maybe your SC belt is slipping ?

IS your SC new or used ? Is it making proper boost ?

Other than that - you may have some serious tuning issues. Fuel system enough and at proper psi ? What's compression ? Total boost at max rpm ? Timing ? Spark plugs color ?

Before you chase your tail for the rest of the summer looking for lost HP like we did last season, you may want to check your hull for hooks, rocker etc.
We went from 1200 to 1700hp in our Top Gun and only netted 1 to 2 mph until we re- worked her pad and rear hull, Instant 10+mph.
It was like the brakes were on @ 84 mph even spinning more rpms.
It's just something to take a closer look at, because I didn't see what others did ,she looked fine to me even with my 6' straight edge.
Good Luck!

Can you tell me who worked your bottom for you ?


You better fatten that motor up...Blower motors wont tolerate lean for long.

Rudy our engine builder @ Diamond Marine Performance in Wilmington DE filled our hook himself .
And that was after several weeks of throwing more boost, another set of brand new valve springs and fine tuning our new engines, that he clearly new were pumping well over 800 hp each,he was right!
Tres Martin has or had a guy that does blue printing on Top Guns, I don't know anyone other than Tres in Florida that does that kind of work.
Good Luck!

peak hp engine 1 864 6000rpm and still climbing trq 804 at 5000 rpm engine2 864 hp 6000 rpm 820trq 5000rpm they were dynoed 4days apart in feb and march 1 . a/f ratio eng1 at 600011.9 eng2 6000 12.0 the old motors were 509s w/ 250 blowers and single holley carbs. hp 630 on dyno trq? the only thing not changed is the settings on the crane boxes.was 5500rev limit, now up to 6000 but boat is at the lake so i wont know till sat if that helps

fixed it, the rev limiters would not let the rpms come up, ran it saturday 113mph on gps still hitting the rev limiter at 5700. going to 34s or 36s then shoul be at 120mph thats my gole