So are you saying my tach is once again off or???????

I would think so. Depending on what motor, Mag or non Mag, you should be in the mid to upper 4000's!!!

Low to mid 50's at 3400-3500 RPM with a supercharged 454?????

Why give any advice to the guy at all if you have no idea what you're talking about?

Supercharged 454 at 3400, right.....

I dont know where your getting supercharged 454 from but it is just a stocker 454 non mag, its a 1990 that has been refreshed 3 years ago thats it.

i would replace your tach and start with a 22p bravo1. not sure on your location, but i have a 22p stock you could try and a 23p mirage plus you could try.

No, not you, bigsbetter. Sorry for any confusion. I still think your tach is off though. You WOT rpm should be 4200-4600 with that motor, I have the same motor just different year. My boat is 23', stock 454/330hp (non mag) and I've been running a 23p Mirage (not plus) and spinning about 4700 rpm in the warmer weather, and about 4800, maybe a touch more, in cooler weather. When I talked to Brett (bblades) he suggested either a 24p Bravo 1 4 blade labbed or a 22p Bravo 1 4 blade stock or re-work the 23p Mirage 3 blade for what suited the boat. Anyways, I would think you should be right around the same prop, and as Brett said, what your numbers are right now, it's impossible.

go with a stock 22p, trust me. save your money. find a nice used 22p and go for it.
i love the 4 blade on my boat. my boat is a 26, but prob a tad lighter then the older boat, 375 hp and i could hit the rev limiter on the right days with my 22p. i went to a labbed 24 and didnt get much out of it, but it doesnt hit the limiter anymore. stock 24 i was way low on the tach.
go with the 22, i bet its right on and handles better and a better cruz speed

I'd love to go with the 4 blade Bravo 1, I tried a 23p Hydro 4 blade and I was a tad too low in rpm, 4400. I loved the way it took off and cruise speed, but I needed more bow lift out of it. My Mirage has great bow lift, just blows out alot and not real good cruise speed. If I could get my hands on a 22 or 24 Bravo and try it first I would, but I'm not ready to buy anything right now anyways. Work had been slow, and I figure my prop gets the job done for now anyways. The 4 blade does feel alot better though!!!

Unless he's got a 1.3 ratio outdrive. That would make it alot more feezeable.

Wooo! I was referring to his boat and prop set up being the same as mine. At around 3500 rpm I'm cruiseing along around low-mid 50's. I wasn't saying that 3400-3500rpm is my WOT top end speed, That's just a fast cruise for me, if that is where the confusion was. It may be 3500 rpm and 50-51 mph, I'm not sure excactly, but it's close. My engine turns 4800-4900 at WOT and runs 70-71mph.