Just curious what speeds and props you are running with your 353?

I've got 500 efi's and 30p bravo 1's. Best I've seen was 77.9 with just ove 1/2 tank of fuel. Approx 5100 rpm. I guess I expected just a little more out of her.

That's right within a couple of mph. You can tweak the props for another 1 or 2 maybe, but you are real close. I personally wouldn't spent the $400- $800 to pick up the last couple of rpm's/ mph.

Dave

I have a pair of 525's and I'm running 5 blade 28's Mercury Maximus. Top speed so far is about 76-77 on GPS

At what rpm?

You should be able to run 79-81. Need to loose the difuser rings, will give you a couple. Do you have ITS?

Dave

The 353 hull really gains BIG MPH from more power

Easy over 90 with twin 600 -

almost 100 with twin 700

Props 32 Maximus lab finished

600 - 1,50 gears

700 - 1,35 gears

compared to 496 HO `s 73-75 MPH

and 525`s 76 - 80 MPH

The 600`s are the very best package

You only gain about 5 MPH from 425-525

13 MPH from 525 - 600

another 6 MPH from 600- 700 (not available from factory)

Would be interesting to see speed numbers of the new 8.2 HO `S

Something doesnt seem quite right. The guy I just bought my trailer from has an 05 with 525's, boxes with ITS and was running 82-83.

Interesting #'s there. So the 500 efi is running close to the same speed as the 525.

I'm just poking around low 70s with my stock 502s and 28p 4 bravo 1s, might do a little work on her for some more speed when I get down South.

No ITS.....B Blades did the props, thanks for your suggestion last summer, they did a nice job...no diffuser rings. Still struggling to get her dialed in any faster.

I'm struggling to believe the 496 HO's will push a 353 to 73-75 MPH. The 525's are a total 200 more horses and only producing a few more MPH for most 353 owners.

I agree. Must be downhill!