I have a 1972 Olds Cutlass S with a 350 2 Barrel and want to know what will be needed (in regards to throttle linkage and brackets), so that I can install either a 410446 intake or a Edelbrock RPM intake with a 3310 Holley Vac Sec carb?


see pic or current setup

 

Current Holley 3310 is 750 cfm, [was 780 originally] and a little large for a 350.
600 - 650 vacuum secondaries would be better, as 'bigger is not always better' when it comes to carbs.
If you've never done it, or even had a distributer out, it's not for a beginner!!

 

Performer RPM isn't good for your set up either. Its power band is higher than you'd want with a stock cam & heads. Get a stock cast iron or a Performer.

 

This will be on a slow (sportsman) bracket car with some drives around town. I have a 410446 coming my way this winter that I prefer to put on to keep it looking more original, but the Edel RPM will be around also.

I will definitely try the original 72 quadrajet 4 barrel (7042250 rebuilt) down the road as well as a 650 Holley spreadbore and the 750 Vac. I just need to see how my current 2 barrel stock throttle linkage connections will change and what parts will be needed to do so for the 410446 and for the Edel RPM with a Holley.

If anyone has converted from a 2 barrel to a Holley please let me know.

 

My 600 cfm edelbrock feeds enough fuel to feed my 13.3 car 350 sbo. Im gonna try a 650 again this spring and see how it goes i had a 650 proform that was way too big. I thing 650 holley would be good and about as big as i would wanna go .my friend is running a 750 vac sec. on his built chevy 350 with afr heads and rpm intake and its too big. last spring i tried a edelbrock 750 that was too big. and i already mentioned the 650 proform . the edelbrock 1406 worked the best .The reason why i say proform and holley is if you cross reference what they come with the proform comes with way bigger jets and fuel squirters than the holley. meaning the proform must flow air much better than the holley . Some local olds racers told me that most proforms out flow what is advertised. One told me the used the proform 800cfm main body and it actually flowed 830 thats a big diffrence.

 

Will I have swap throttle linkage cable and linkage bracket to run a Holley? If so, please provide all of your details on what is needed to do so.


Thanks

 

you will need a throttle bracket. Then go from there i modified my bracket and bent it to fit and the throttle cable will have some weird bends in it but i never had any issues.

 

A vacume secondary 750 too big? Geez Q-jets are 750-800 cfm. The Holley uses only what it needs with the vacume just like the Q-jet. The 600 is too small IMO.

 

That was just my experience. I tried those carbs and the easiest to work with was the edelbrock 600 and I felt little to no power loss over the 650 proform. And the 750 edelbrock bone stock ran like carp . I'm going to get anothe 650 but a true holley dp. I never felt the 600 wasn't feeding enough fuel even at 6k. But that was my experience.

 

i'd say that all you'll need is a different bracket. your best bet for a simple install it to get the bracket from the carb manufacturer. it's too bad you can't find a non egr manifold/q-jet that someone pulled as a unit to set on there... to me it would be best for your set up and with the hot air choke it would be an easier swap... just my thought... nothing you have listed is really out of line for what you want to do but i'd try to keep things pretty well matched, a high flow intake won't do you any good with a stock single exhaust...

 

I almost forgot to mention this the proform did work good. I got it to work real good with a lot of tuning . But it was so touchy to weather changes every day it would change. I stuck with the edelbrock because it would hold a tune pretty well over the proform.

 

I found the throttle cable and bracket for the 4 barrel Qjet @ inlinetube.com. The 410446 is the non egr intake, so that's good. Plus I really don't want to buy another intake for 5hp.

I will try the 750 vac sec on it at first with the correct adapter, since the stock Qjet I have needs to be rebuilt.



Thanks Everyone

 

i think in the long run you'll be happiest with the stock intake and a good Q-jet... i've never tried to run a squarebore carb with a adapter on an olds intake so i don't know what you should expect but it's a starting point....

 

I'd wait till you can get the Q-Jet rebuilt before I put on a 3310 with an adapter plate. That 3310 will run on that engine but it won't help the bottom end and it will drink gas like no tomorrow. If you have to have an aftermarket carb I'd use a 650 Holley spreadbore, I've used several of those and they work great.

 

I went from a 350 2bbl to a 455 with an edelbrock carb and intake, and then even a holley and never had an issue with the stock cable.

 

svnt442 do you have any pics that you can provide of your setup. This car will be bracket raced mainly and only locally driven on occasion as it will have a 3.90 gear. 25 years ago I used to drive to college in my Ford Torino with a 4.57 rear gear and 32 miles round trip. Drove fine, but gas was like 79 cents a gallon back then

 

Unfortunately no. That car went bye bye about 16 years ago.

 

Nick, I've tried to convey this before.
The situation is aggrivated with a short dual plane stock type intake manifold, and a smaller carb. High air velocity at the boosters will not make the turn at the runner logs under the carb, and contact the bottom of the runners, resulting in fuel dropout. A larger carb, or a spacer is a fix and it will pick up power. This problem is not as prevalent on taller manifolds, and the smaller carb will work better with these manifolds.

I hope I have explained this so others can understand the phenomena.

It is best to try several different carbs (borrow 1 or 2 from friends) and verify results before you purchase anything.