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I have built a litttle 350 motor .030 over modified stock heads flat top pistons and a little bit bigger cam was just wondering what size carb to run and maybe some suggestions on a brand just useing it to run around town and maybe pull a small boat to the lake.
Thanks
ChevyDave
600 CFM should be plenty. Although there are those who would argue the point, I like an Edelbrock with manual choke. They're easy to dial in if you read the owner's manual and keep fuel pressure at or below 5 psi.
I agree with Tech, a 600cfm vacuum secondary Holley sounds right to me.
Yeah I figured this would start a contriversy so around the 600 range. One more question I shouldnt have a problem traveling very far with this motor as far as overheating or burning it up.
As long as the motor was built right and the cooling system is good. You can drive it coast to coast, no problem. And also the 600 is the way to go.
If ya do the math, 350 cu.in @ WOT only requires 485 cfm.
use an Edelbrock 500 cfm
Remember --- you can re-jet a carb - but ya can't take out cfm
i would go with edelbrock also. in my limited experience it holds its tune better. i run a 600 cfm on my 350.
Just my 2 cents worth, holleys & Edelbrocks are both good carbs. But for everyday driving and sometimes showing off you just can't beat them old Quadrajets,they last forever and they are, set it and forget it.
I'm always torn over carb selection (brand, not CFM). Do you guys feel that specific manufacturers have an inherent advantage in some ways? E.g. edelbrock better for street applications, holley better for track, etc? I've never attempted to tune my carbs but have used both Quads and Holley's good ol' 3310 750 CFM on my 396.
What do you guys think about Demon carbs? Overkill on a street motor?
You know, the more I think about it, the Q-Jet just seems to make the most sense for a perf.-street engine. Small primaries for MPG and massive secondaries for when you want to open it up.
What's be best route to go about snagging a q-jet? Visit a boneyard and snag a carb for $20 and then have a go at rebuilding it? I hear that q-jets can be a bit of a challenge to rebuild and even more-so to tune correctly. Thoughts?
What about aftermarket spread-bores? A better idea?
IMHO that old theroy of picking a carb is outdated. doesnt take into consideration alot of things.
id use a 600 holley. i have never had luck with an edelbrock but alot of guys buy them because there cheap. your call there
Edelbrocks always get my vote. Pretty much bolt em on and forget em. :) I ran a 600 manual choke on my T and got fantastic milage, smooth operation, and no trouble ever.
Don
of course a good built quadrajet is a nice trouble free carb as well. laugh if you want. the one on my truck has over 100k miles only rebuilt once! never had to tune it a bit!
I have a quad. right know and it needed rebuilt and I gave it a shot not sure if I did a good job or not havent had the chance to fire it up yet. Everyone said that rebuilding one was near impossible but it didnt seem hard at all.
ChevyDave
Rebuilding a Q-jet is a breeze.kits are cheap (or usta be ?) haven't done one in a while but have done hundreds of em over the years. Last one I did was for my Ford 460 Dually several years ago,made a mounting adapter and replaced that troublesome factory Holley that Ford used.Ran so good I wished I had done it lots sooner. It also helped the around town mileage out.
Edelbrock 1406 (electric choke) is a good bolt on for SBC. I've used them on 305/350/400 in stock to modified and they perform well. I have found they run a bit rich and may require a re-jet but they are very easy to re-jet.
For a street/mild performance carb the Edelbrock 1405 (manual choke) or 1406 is the only way to go. Get a rod and jet kit follow the instructions in the manual and you'll have a carb that runs right, not rich, won't stumble or lag when you put your foot in it, gives good gas mileage and STAYS in tune through all seasons.
To me Holleys are too tempermental hard to keep in tune let alone expensive to tune
It is really each to their own--just like some guys wouldn't be caught driving a Chevy others a Ford;)
Summit Racing sells the Edelbrock 1406 for $285, The Holley 4106 for $275 and a re-manufactured QuadraJet (750cfm) for $269.
Price really is not an issue - All work well and all have their advantages (and quirks).
The QJ sounds really great when the secondaries open and Chevy has used the 750 QJ on everything from a 305 to a 454.
The Holley has been the racer's choice for a long time.
The Edelbrock is really simple to tune with a very complete range of valves and jets.
It comes down to what you want to run.
Kind of like, "which stereo is the best? Sony? Kenwood? JVC?, Bose?"
Well thats part of my problem I have never ran anything but a quad. so I havent given anything else a chance and also never built anything but a stock motor so just wanted to hear from the pros.
Thanks for all the info
ChevyDave