QFT makes marine carbs now..The are neat looking also

http://www.cpperformance.com/c-1500-...rburetors.aspx

Hey, I hope you didn't throw away that 3000$ Quadrajet off the 74 SD transam!! I have also worked on a few LS6 Chevelles and they had factory holley 4557 carbs from the factory so unless carb was trashed or you were building a total dragster I would make the stocker work!

Nope ...sold both cars with the original carbs mounted on them to keep them original. I respect the purity.

The LS-6 got "Temporarily" a Holley "3-barrel" 1000 CFM sitting on top a first generation Edelbrock Tarantula (I know...I'm dating myself) and a set of 2 1/8" primary "Hooker" headers. With 4:56 12 bolt and M & H wrinkle wall drag masters...we ran 11.4 @112 MPH. the car ran 12.8/105 stock. The big improvement was the 455SD. Going to a Edelbrock square bore "Ram Air VI" intake with a 850 DP we went from 13.7 @101 to 12.1@114. The Holley ate the Q-Jet up in the 60' times. :evilb:

Getting back on track...I love the feel of a DP on a boat, It's always there...snappy throttle response. I've been in some tight spots running inlets in weather that I shouldn't have been in. The Holley throttle response up and down in those situations made a huge difference.

On a lake or river where it seldom becomes a critical factor I guess a vacuum carb is a fair choice...but in the open ocean or the great lakes when you need immediate throttle response...you can't afford the lag time of waiting on secondary barrels to cut in on a vacuum carburetor.

It's a fair debate and one I enjoy.

+1 ...and just because the Edlebrock provides you with greater ease of tuning and flexibility dosen't make them inferior carbs. There's a systematic process of dialing in the right jet sizes and metering rods once you have the right size carb to begin with.

i would agree i build alot of custom cars for ppl and one of my fav combos is a 383 stroker putting out about 425 with 9.5 to 1 comp i always use an out of box stk 650 electric choke on these things and have never had any tuning issue. If you are are putting 2 750 dp holleys on i think that is way to much. I might of read the posting wrong but it sounded like you were going to use 2 of them. My drag car is a 464 buick motor running deep in the 10s and i run a 950 hp holley so to think a stoke sbc needs 1500 cfm unless there is a blower or something i missed i think that way over killl

as far as the charts go with the edy i think they are helpful they have 2 differant color dots one that is cover by the tuning kit and the other are other parts you would have to get on your own. its pretty easy to look the number dot up you want and put those parts in and try.

From my experance most tuning can by done right in the springs and rod and almost never need to change jets unless its something big. so you can test change right on the water in minutes and test again with no gas spilling on the motor. i also like that they have no gaskets below the gas level no leaks. my opnly issue is they are harder to set the float level on than a holley. but to change jets both carbs harve 8 bolts and 4 jets just depends. plus the edys dont have power valve to blow. just remeber with the edy the stiffer the springs the sooner you will get power enrichment. most ppl think of it backwards. when tuning a carb i always add gas first to prevent a dangerous lean condition if it gets worse then i take away. what issue are you having directly maybe you said and i missed it

2-carbs, one for each motor. Holley doesnt offer a 650cfm carb with mechanical secondarys, so I went with the 750s.

With the cams you are running on 383's a 750 DP will probably nail it.

Run what you brung. Should be good to start with that. The carb is a little big tho
 

:cool-smiley-027:

Edelbrock has the kits to fine tune the Weber s / Edelbrock marine carbs. I buy them and have no problems dialing in those carbs right but for the past 6 years I really do not see that many carb apps anymore especially currently ..

It is wise to have a strong working complete ignition system as well. Can not tell you how many times boaters try to dial in their carbs and they have 20 year old ignition components and 10 year old spark plugs. Also for merc apps using the T bolt V ignition you have to put that in base timing mode to dial in the idle and some other adjustments for jist.

I live in Bowling Green, home of Holley and Quick Fuel. Quick Fuel is a very good option. Holley design refined. They run all the carbs on engines before shipping. Holley is doing a great job now as well.