That carb will be fine, bolt it on and experience a night and day difference The stock jetting will be fine, Im running an AED 850 with IIRC 80/90 jetting( stock AED jetting) Remember this, its NOT the jet size or the size of the holes (CFM rating) its the RATIO of air to fuel thats important. The bigger hole (CFM rating) the larger the jet needs to be to keep the ratio intact. You CAN run a smaller CFM carb and your lower end response will be awesome, but that response will taper off pretty quick and the engine will starve for air as the rpm rises, and your performance will suffer. I chose 850 CFM for mine because I didnt want to leave anything on the table, plus all the Chevy guys said its too big Go with the carb you linked, you'll be good!
750 dbl pump get the one with the 4 corner idle I had a 30 hp increase between a Carter AFB 750 and the Holley Dbl pumper on a engine dyno. The carb you have picked out there looks ok I never ran one so maybe someone else will have more info on that.
It has a 4 corner idle. I'm probably going to do an air fuel meter first just to see how far off everything is with my edelbrock. This project will probably get drug out for a couple more months. I dont really have the extra money right now to keep throwing at it.
I got my off idle launch decent but nothing like what I imagined. I have 2:56 gears and a single plane. Probably going to have to get a stall and lower gear no matter what carb I choose. I'd be happy with enough power to do a break stand. I'm not there yet. It bogs. But if hammering it from a dead stop I get a little spin. It use to fall completely flat when hammering from a dead stop. I've made tons of progress there. Dont want to go too low on gearing cause I'm 20 miles from the closest city. Lots of hwy driving for me.
Yeah not too bad 3;36 is ok if you don't want to go too low 342 would be better a 355 might be good for you. Then you can use a 275-60-15 tire which is 28" tall The next smaller tire will be 26" tall. I run 373 and with the 350 trans you will be turning almost 3 grand to stay at 60 mph. I switched to a 2004r now I turn 2200 rpm with the convertor locked up and going just about 70 mph now. The intake really doesn't get going till about 3 grand so your 256 gear is not very good for that SP intake.
A 275 first gear in trans with a 22-2400 converter would probably work well . The gear multiplication will help the stock gears . The 70 rear is difficult to find parts for.
I was aware that most single planes perform best at upper rpm but TA's own website describes this as out performing the stock 4 barrel across the whole rpm range. And out performing their own stage 1 intake by 25hp at high rpm. I was under the impression I had nothing to lose by going with this intake. Is the intake causing all of my problems? Will I see a night and day difference with the double pumper?
The right thing to do is cam, heads, intake, carb, headers, convertor, & big gears. Then.... if you want to x-way drive, an o.d. trans. It's only a mouse motor, (350) so you need all the goodies.
No the intake is not hurting you. You might be going a tick slower with the intake since you have those low gears but I wouldn't worry much about it. What Mart said is correct you need it all if you want to kick *** Heck I started with a 268 Comp Cam and some headers with the 4bbl carb and all stock with the rest and yeah that 256 gear. That was way back when this site was not here and there was hardly any help for the 350. You had to do a lot of reading to get to the Buick stuff and I found the Kenne Bell performance parts and just listened and watched and did a lot of reading. I actually think the intake makes the engine run smoother and starts up quick and keeps running when cold.
I'm hoping to see a great performance improvement with a double pumper. The gears, stall, and overdrive will come eventually
Go up 3 or 4 gear sizes. Get the rpm's up in the power band. I first put a Crane cam in with 3.08's. It wasn't till I went to 3.90's that woke that cam up....
I read articles like this one from hot rod and it makes me believe I need a vacuum secondary. I don't want to be forced into buying a stall, lower gears, and an overdrive transmission right away. I do alot of hwy driving with my car. 90% hwy use. doing too low of gears is not an option without an overdrive transmission. I really just want a carb that will work the best with my current set up. If I buy a 750 mechanical double pumper and end up worse off I'm going to be pretty upset. https://www.hotrod.com/articles/vacuum-or-mechanical-secondary-carburetor/
I just searched the boards and have read many examples of the 750 cfm mechanical double pumper being the only carb for the sp3. Sometimes I just need a little reassurance lol
Ring and pinion gear in OPG for around $400 10 bolt 8.2" 3.55. Will this work? What is interchangeable with my rear end? My brother has a 69 chevelle parts car. Where do I even begin to look? Summit, ebay....?
Gsjohnny has had great success with a 650 cfm.. what's the main reason I should choose a 750 over a 650 with my current engine and drivetrain?
Me thinks so too. The SP3 is really a no downsides intake for the 350, The biggest difference I've seen is uniform plug coloring. The Buick 350 is magic Dont believe blanket statements that street cars need a vacuum secondary carb, the Q-Jet is a mechanical secondary, the only drawback to it is there is no accelerator pump for the secondaries, even at that, a Q-Jet will flat blow away a vacuum secondary carb. I went almost .4 quicker in the quarter mile switching from a Holley 750 vacuum sec. to my original Q-Jet. Double pumper for the SP3
First, quit reading Hot Rod on what to do they gear everything towards a Chevy motor and they don't know dick about a 350 Buick motor. I read a lot of them and have a collection of them the rest they do is legit since all the other stuff applies but as far as what to do with a 350 motor..forget it. Listen to us we have been doing this for 30+ years with a 350 Us 3 right here have done plenty with a 350 motor beside gsjohnny and a few others that have made it happen. Yes, a 650 will work gsjohnny has a light dragster and that carb works great for him. He has since upped it to a 750. He doesn't get on here much because the Keyboard typewriters seem to know more than him. He does the real work and makes it happen. Vac secondary carbs suck nothing but air and will not make the car run that fast. What you get from those carbs is a quick out of the hole because you only open up the front two barrels on that carb. The back come in as the rpm rises, and will not open up all the way till you hit 7 grand. I run nitrous, Mart has 410 gear, gsjohnny runs a blower, and Demko is rolling with a roller cam we rock and roll.
