Guys,
Thanks for all your help ill be in touch. I understand all comments and concerns and appreciate it. A few numbers may be off a bit. I don't care to ever spin them to 5400,5500 nor 5600 EVER but I did on Sunday. I guess I did get a little excited with my original posts but I was very happy with the upgrades. I understand that 250's are a street blower and they are very inefficient they really don't seem to help anything over 4,900 IMO with my setup. The new cam is robbing a lot of boost! With my kind of boating 5100 or less I'm fine with. I only care about a cruise speed and they perform well between 3500-4500 and always have for the last 600 hours. Now please remember this is not a 100+mph boat It means nothing to me to try and squeak every little MPH out of this hull and over trim to spin higher RPM or whatever. I will be trying some different props to see what I can run safely to prop the boat for 5100 WOT. I did this with my last setup on the 29 and had many trouble free hours. Most boating days are long distance trips not sprints to the "party Cove" like we did on LSC in MI. I do understand most of you spend tons of time tweaking every last little thing on your motors and are very proud of them and I appreciate that. I believe most cases of good experience comes with a little trial and error for successful builds.

Carry on....

Its hard to go off pulley sizes. I tend to go off my total boost gains/decreases and to get to 5.5-6.0 I dropped 2 sizes. Some would say that it's a 7.5 lb pulley but change a Cam it will change boost.

New cam is "robbing boost" ? Are you being sarcastic ?

Actually the 250 blower isnt that bad, on a 454 like you have. I have seen 250 B&M's support over 700HP, just not with a little single 825 carb.

If you went down 2 pulley sizes, and only gained 2psi, sounds like the engine is starving for air. I am only posting this info, because I have played with these blowers, on 454's, and thought you wanted to dial in the setup? I dont know what kind of cam you installed, but did you tell Bob M you only wanted to turn 5100 or so?

Time to put a vac guage just under the throttle blades. Heh, some of the marine BG's have vacuum ports in the base of the carb..if so, this would be a great check.

Also MT, I can't answer for his setup, but most BG's flow a good amt more than Holley's rated at the same cfm. Seems the two companies flow tested their carbs different ways. Some say that BG flowed there carbs 'wet'.

I had a BG 950 on a 177 on my engines 5psi. Boat ran 77-78. Switched to B&M 250, single dominator, 7lbs, 83mph. Switched to 420 B&M's, 6.5lbs, 88mph.

Back when I ran the 250 blower, going from a 3.34 (155193) top pulley, to a (155192) 3.00 top pulley, netted a 2psi gain. That was 1 pulley size smaller. We had the exact same results with that blower combo on a 509ci.

I dont exactly remember the jet sizes in the 950BG I had, but they were up there a bit, well in the 90s, Wanna say 92F with pv/96R. On the 250/dominator combo, I was 96/96 with front/rear pv's. Oneanddones 80p/90s sounds awfully light on jet. Then again, its a BG, and I dont know them well. I'd have to imagine that an almost 9:1 454, with hyd roller Bob M cam, rect port heads, 250 blower at 6lbs, would be making quite a bit more than a stock 525sc. Prob somewhere around 600-625HP?

SB, was it you that ran the dominator sideways years back on a 250 blower?

in my experiances with bg carbs they required bigger jets than a holley with same cfm rating.

Back when I ran my 454 with a small blower 5LBS back in 1988, No way to log AFRS other then read the plugs,I had a 850 Holley boost ref, running 92P 98S, pvs front and rear I have to think oneanddone is lean as well

Ill be adjusting timing and checking AFR's and going to try some 28's and 30's ill update with some new numbers when I get them

Thanks Guys!

Good luck. Keep us posted on the results.