86Dragster

I need a new carb because my old one is wore out. Which would give lots of horses and torgue that would fit on a edelbrock torker2 intake manifold?

MonteMan357

welp ive got my Holley 650 Double Pumper for sale if you want one for a good price. Should be plenty for you. Pm me if interested.

MonteMan357

pic 2

mw66nova

iTrader: (13)

you got me interested! how much?

five7kid

iTrader: (14)

Assuming you mean "torque", that and "Torker 2" don't belong in the same sentence - despite the misnomer Edelbrock has gotten away with all these years.

Assuming, of course, that when you say "torque", you mean that SOTP buttdyno effect at stoplights.

MonteMan357

Im looking for about 250 OBO. It was just rebuilt with the Holley Trick Kit . It was completely disassembled, acid dipped to clean it, then assembled with the trick kit and i painted it with chemical resistant paint. It is Model #4777S in summit for those interested, lists for $390

Hollowmangt69

i was wondering which would be best for my engine. a 600 cfm or a 750 cfm edelbrock carb. i'm looking for power. Oh ya the engine is a 350 rebuild.

86z/92rs

Depends on what heads, cam, and manifold you are using. Post your build sheet.

MonteMan357

oh and i apologize for the hijack...we need to know a lil more about your setup before recommending anything, but for a pretty run of the mill 350 id say 600-650 CFM

Hollowmangt69

well i bought the 350 from a rebuid shop. I'm assuming its just the run of the mil 350. Probably nothing special. So it sounds like the 600 cfm is the best choice.

f355bird

iTrader: (2)

Yes a 600 will work great for your setup

Hollowmangt69

well if i want alot of power out of the engine the 750 would be best correct ?

mw66nova

iTrader: (13)

with the proper cam/intake/stall and gears, yes, but with most stuff stock, stick with the 600.

Hollowmangt69

cool.

89blackm

i had a 750 holley double pumper on a (mild) 350 and it seemed to bog my car down sometimes.It was just too much gas for the motor.Yes the car was tuned and everything. But will work great for the 350 now

Fast355

iTrader: (2)

If you have a manual or an auto with like a 3,000+ rpm stall and 4.10+ gears, go with the double pumper. Otherwise go with a vacuum secondary. A double pumper on a street driven auto is a really sluggish, slow, and gas hogging combo.

blacksheep-1

in a word BG
http://www.barrygrant.com/

SadistikZ-28

here's a little formula to help make your decision

Eingine CI / 2 = X, Maximum RPM / 1728 = Y, X x Y = Carb. CFM

350 ci / 2 = 175
5500 rpm / 1728 = 3.18
175 x 3.18 = 557 CFM

Or this will work as well.

Engine CI X Maximum Rpm / 3456 = Carb CFM

But, these formula's assumes 100% volumetric efficiency.

Fast355

iTrader: (2)

Multiply those numbers by .85 for a good street engine at about 85% volumteric efficiency.

Big454blockchevy

I would also say that for a "run of the mil" 350 go with a vac sec carb. I would even prefer a 750 vac sec than a smaller 600 dp carb.

five7kid

iTrader: (14)

I wouldn't.

Big454blockchevy

Hey but what do I know I'm not a moderator I still say vac secondary instead of a double pumper.

five7kid

iTrader: (14)

Being a mod simply means I check to make sure people are following Board rules. If I post a tech opinion, I'm no different than all other members.

VS lets you get away with putting too big of a carb on a given engine without too many harmful effects. It's a silly thing to do on a performance engine. The Holley website has a chart that allows you to determine whether or not a DP would be too big for your combination - stay within those limits, and you won't have any trouble with a DP that would make it less desireable than a VS.

Big454blockchevy

Didn't he say he was running a "run of the mil " 350? I have 750 secondaries on all my truck engines (4x4s) and all have given me good gas mileage and better performance than the 600cfm. For performance purposes go with a 750 cfm don't let anyone tell u any different. A purely daily driver and not worried about perfromance go with the smaller 600cfm. I've tried alot of conbinations at the track and even tried a 650 dp and lost a full second!

five7kid

iTrader: (14)

No, the originator didn't say. But his member info says "350" and "5-speed".

Other people's questions are hijacks.

Big454blockchevy

I just get the funniest feeling you are being a bit to negative . Hopefully I am wrong.

Big454blockchevy

So by this post you absolutely say don't go with a 750 vac secondary carb. huh

Big454blockchevy

[QUOTE]Originally posted by five7kid
[B]Being a mod simply means I check to make sure people are following Board rules. If I post a tech opinion, I'm no different than all other members.
ok

five7kid

iTrader: (14)

WOT shifts with a manual tranny is one of the reasons to not go with VS. Assuming the tranny is a T5 (not too big of an assumption, but an assumption), you don't want to be keeping the throttle open during the shift (aka, power shifting). Let off the throttle during shifts, and the secondaries are going to react in an undersirable way. Same story with q-jet, Performer, AFB, or any other demand-based opening secondaries. With DP, that isn't an issue.

You also won't be fully opening the secondaries with a 750 VS on an assumed-mild 350 - for what that's worth.

In general, I have pretty a negative view of VS carbs in performance applications. Trucks, fine. On the family wagon which tows the Airstream, fine. If you don't really care about having the best possible carb on your performance-oriented car, fine.

But then, I don't have a very high opinion of the Torker II, either...