I have a 383 stroker, aluminum heads 64cc, aluminum roller rockers, 557 cam ( not sure of duration) Looking for a good 750 carb for it. Thanks
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I have a 383 stroker, aluminum heads 64cc, aluminum roller rockers, 557 cam ( not sure of duration) Looking for a good 750 carb for it. Thanks
A 750 seems a bit large for that motor. 550-600 is probably good for a street/strip setup.
It'll make the most power with a 750. Driveability (throttle response) may be a little better with smaller primary venturis.
If you haven't yet purchased a manifold, I'd recommend a Performer RPM spread bore and a 750 Q-jet. You'll be very pleased with the results. GM used this carb on 305 - 350 engines and it just flat performs. There's nothing like to sound of those monster secondaries coming to life!
Quote:
Originally Posted by glennsexton
I agree, a Q-jet
Ken,Quote:
Originally Posted by kens383stroker
My stroker sounds similar to yours and I run the 770 Street Demon on mine. It was dyno'd with that carb and set-up at 457hp. I run the Preformer Air Gap manifold with a 1" spacer. My cam is a .248 duration int/exh with a 613 lift as I recall. As folks have commented, so much comes into play on choice of a carb. What trans do you run? I run a shift kitted 700R4 with 2800 stall. I am totally happy with how mines runs out...
My 2 cents worth - Greg
I realize I am posting to a carb thread/crowd and should likely find a rock to hide under after this entry.It is off topic sort of too.Well it is a fuel system.I suggest this O/P looks at Edelbrock EFI fuel injection systems which is tune on the fly and has systems that are large enough to support the size of his engine.The newer versions are SFI,but pricey.
Yes, and did you see the new deal by FAST? They now have a setup for dual "quads".Quote:
Originally Posted by 1gary
All deppends on cubic inches and how many Rpms it will turn.
I think Bluvelle is probably closer to the carb size.
750 is to small for my built 351 Cleveland.
Really depends on how hard he's gonna run it.
Also thats a great choise on a intake to Bluvelle.
Kurt
Yepper-I saw that.Thing is Fast seems to have a lower entry level cost,but to buy all the parts to complete it costs tons more.Quote:
Originally Posted by 34_40
I've never even considered any of these systems actually! But with a recent purchase of an intake that may have changed. I have heard some good things of the FAST System and it's products. But, as always - cost will be a factor!Quote:
Originally Posted by 1gary
Thanks Kurt!Quote:
Originally Posted by vara4
I'm very happy with the way my car runs out and I think that crab/manifold match-up is optimum for my lil' stroker! :)
Greg
I have a 383 that was dyno'd at 450 hp/468 ft lbs of torque. I run an Edelbrock 750. I know I probably could have made few more hp with a Holley, but I like the Edelbrock because I can get 20 mpg with it out on the highway. Any of the carbs mentioned will work well for you. It essentially boils down to a matter of personal preference.
best for cost effective is the above mentioned qjet. "750" qjets have flow tested near and above 800cfm with the spread bore you get awesome throttle response for the street and good milage (as long as you keep your foot out of it ;) )as far as intake edelbrock victor jr. air gap is almost fool proof to make power with
edit: qjet can also be reworked to flow over 1000 cfm so it can grow with you
Since you live in Illinois like I do, I would recommend the Performer RPM intake rather than the Air Gap if you plan to drive it is cool or cold weather. Air Gap intakes do not like cold weather. If it is a fair weather car, then it won't matter.
quadrajets have theee worst secondary metering system on the planet which consist of a set of what I call 'piss tubes' and what others call spray bars.
The primarys are so tiny, which house large [compared to the primary venturi size] boosters which together give great low end/milage but offer lil cfm in relation to the secondarys huge flow..which only strengthens the argument for why the heck couldn't they of come up with something better than 'piss tubes' and no boosters..
If it wasn't for stock class/fast class rules they would have all been recycled by now, and rightfully so.
A thermoquad is better piece, and I still would not recommend it for what you are doing because it is to a ventilated dinosaur bone.
nothing meters as well as a square bore.
Yes you are able to more fine tune the cruise with metering rods.. but in the end you'll short power wise with spread bore.
How big a carb you can get away with [without sacrificing low end] will directly relate to tune/compression.
The cam already gives us a power band or rpm, so now it's a usage requirement.
How much initial timing do you run for right now?
750-830 annular square bore.
spread bore carbs have poor wot metering.
quadrajets have sewer pipes for secondarys, if it weren't for class rules they be recycled.
Bye bye throttle response:eek:Quote:
Originally Posted by kens383stroker
A good formula is (displacement x rpm)/3,456. This formula assumes 100% volumetric efficiency (VE). A strong street motor will usually be around 85% VE, a race motor may be close to 100%. Take the results from the formula x your approximate VE. For example, if you plan to turn your 383 6,000 r.pm., and it's a street motor, 383 x 6000/3456 = 664.73 x .85 = 556.19 cfm air flow, so a 600 should work well.
This is what I have used in the past. Is this not a good formula?
I agree with Wild . Q-Jet's work ok on Stock to Mild Street Engines . And they have a Nice Rolling Punch to them . But they are Problematic in many ways and way over Price-ed . You never hear the true negative Side to them small front to Large rear barrels . I have worked on the Very First Q-Jet Models and the Computer one's and Know how to Mod them if I have to use one . I have one on My SB Chevy Pick up . It work's ok it has some of the normal Q-Jet Problems . I am saving for a Edelbrock Performer carb to replace it ;) And them what you call sewer pipes a Lot of the Time fall out into the secondary fuel well . I have had some fun with Q-Jets but they ain't what Folks try and make them up to be .Quote:
Originally Posted by 1wild&crazyguy