No, they don't. Most actually flow more. Best way to tell is have them flowed on a flow bench.

Looking at the week of the 17th BTW.

OK, weekend of thanksgiving is bad I will be away other weekends fine, even weekdays I will be here

Absolutely you can make that HP with a 4150. I agree.

The more air a motor demands, the more a carburetor of any size will flow. Airflow thru a carb doesn't hit a wall, it will keep flowing more. However, you get to a point where the restriction will become more and thus more pumping losses also.

The 650Hp is my rule of thumb where a motor can take advantage of a Dom for some more power. If it doesn't, chances are the fuel metering of the carb is the issue, not the airflow.

I find more people in the auto world over carb than the I/O boat world. That's what I see anyway. People that call/talk to me seem to do and then ask in the car world vs the I/O guys ask and then do.

You mention you've had carbs flow tested. What do you use for a test depression for your #'s ?

My favorite way to test a carb's worthiness, is on a dyno, and look at if and how the engine responds to the change, in its output. A 750 BG, 750 Holley DP, and a 750 Ultra HP, may all make a different power number. A 1050 4150 style, up against a 1050 4500 style, may again have different results.

Sometimes, just because you have an engine that may only "require" 750 CFM, doesnt mean a 750CFM carb is gonna work best, or that anything larger would be a waste. Heck, there were millions of 70's era anemic 200HP 455ci engines, and 454ci chevys, running around with 800cfm quadrajets. Did those engines NEED 800cfm worth of airflow, heck no. Did the carb's work well, provide excellent driveability, and fuel economy, they sure did. The beauty back then, was that carb would work well on Mom's station wagon, or dad's 11 second Chevelle. It was the design of the carb, not just the CFM rating.

I would say as much "over carbing" I see on the internet, I see an equal amount of under carbing. I've seen guys bash dominators, saying how they wouldnt idle, werent worth a chit unless flat out drag racing, installed one and was a turd, when in reality they simply didnt know how to setup a carb.

Black or my wallet will be black and blue lol

Alright, so you'll want good valvetrain parts (of course) and will want older style / less aggresive (ie: lower) intensities. It will cut some power (BBC's pretty much love as much lift as you can give them and/or afford to give them) but will gain you a lot more valvetrain hrs. RmBuilder is an advantage here too, as he not only totally understands criteria like this but is also able to get you very 'smooth acting' lobes vs many of the 'box' companies.

Oh, my bad. I thought holley over rated all their stuff. Is it just some models that flow less than their advertised CFM?

Talk to dale when the time comes. He will sort you out.

Mine were on Scotts 353 in the past, I know he had them flowed in the past, gotta see what and if, for now these may be the last thing in my build if I run low on money I can upgrade these later..