I have a Edelbrock carb 750 cfm that i had on my other boat with a 455 Olds and now im building a BBF 460.  Im just wondering if i should use it or go with a 850 Holley DP?

Im kinda leaning to the holley, So my question is what would you guys do?

Im thinking sell it on Ebay and pick up a Holley, or should i just run it and go from there. And what is the difference on car vs Marine carbs.  This has probably been asked here before but i dont want to do it twice

People here give out good advice, soooo......... lets get some


2sav

The difference between a marine and an automotive carb lies in the vent tubes. Automotive carb bowl vents stick straight up, whereas the marine vents are "J" shaped (hence the name "J tubes") so they point down into the bowl. The purpose of this is so in case the bowl overfills the extra fuel gets dumped back into the motor rather than leaking all over itself, preventing a fire hazard.

I've had the question.  Right now I've got a q-jet that runs like a charm.  Fires up, idles, and purrrrs.  I actually like the vaccum secondaries because I can part it at 4200rpm and keep the gas bill down.  BUT what would a 750-850 Holley dp do for me?  With less than 400hp now, will it give me any bang for the buck?  The dp should have a better throttle response -but that isn't needed in my large boat...

I swear by the demon. The Holley's are great, just a little harder to get support from Holley.... I had the 1050 Dominator on my truck, worked well. Needed to be tweaked constantly. When I called Holley for input they referred me to my nearest auto parts dealer who knew nothing. So on my jet boat I went with the 850 Mighty Demon, tuned it once and never touched it again. The demon was not a marine carb, however I have been told you can buy the "J" tube and install it...

A few of my friends have had edelbrocks. Easy to work with, not much in the way of tuning options compared to the others. The way I understand it, the edelbrocks are in the "beginner class..." haha. I really liked my Demon. Whatever carbed engine I do next will have another Demon.

I've got a Mighty Demon 850dp and love the fukin shit out of it as of late . Holley's and Demons are pretty much the same thing . I think the demon has more adjustability though .

I thought those shiney things Edelbrock made were tire chocks 

-beerjet-

I just ordered a Holley 800dp (4150, pn 9022?).  I was told for my application it should be tuned out of the box from Holley.  Are there any pointers I need to follow?  I'll have to change the throttle location, install the fuel log, and square bore/spread bore adapter, but I think that's it.  I hope it works and doesn't become an expensive paperweight. 

As it runs now with the Q-jet:  WOT is ~4800-4900rpm.  Think I'll see 5k w/the new carb? 


Hopefully next weekend I'll make it out for a test run.  Any takers for a ride w/some Carb experience?  Free beer and ride w/your expertise!

Go 850 Holley. On my 455, I picked up 500 RPM over the 750 vac (though the 750 did have some problems).

Sitting in my garage. Ran good (recent rebuild - herbert hyd .490 lift 230 duration cam, performer) , it was the boat stringers that got trashed. I had to either fix the stringers, or change to a different engine. Given the fact I have 4 BB mopars in the garage, my entire fleet is Mopar (inc a 12 second 440 van and a 9 second duster), the choice was clear (and a good excuse).

Here are a few

My BBF has an Edlebrock and until it craps out, I'm going to leave it on there.  It doesn't have the "J" tubes either so I just hope it never over fills the bowls.

You don't have to worry the Edelbrocks don't have J tubes.  Just grab the part number off of the base of the front and type it into a web search it will tell you what it is.  A lot of the shelf edelbrocks for automotive applications are calibrated for small blocks and generally need their "calibration kit" to work a little better.

A Sea Demon is on my Glastron, and until it shows me an problems it will stay their, but I would not have chose it personally. Our wholesale supplier and Summit Racing chose to drop the whole Demon line due to too many problems, porossity and manufacturing defects.  We bought a pair of Demons once that had a porosity problem, just kept flooding over no matter what you did with the needle and seat.

Holleys are great carberators and the HP series are eaven better.  But generally the HP series holley cost more than a Proform, Quick Fuels or AED carb and wont flow as much.  The Engineer at quick fuel Technologies told me that the 950HP holley only really flows about 860cfm compared to their 950Q which really flows 950+. The difference being the 950 holley = 850 baseplate + 750 based body. 950 QFT = 850 Baseplate + 950 Proform Main body.  However the 950 holley does have an awesome Booster signal and throttle responce.  That Info finally solved the mystery of why the 950hp Holley works so awesome on my SBF, compared to the 850 dp which never worked worth a crap on the same engine.