Whats better rochester or holly

[commo_lover]

hi guy whats better to run i have a 308 stroked to a 333 it currently has
a torker manifold with a rochester quadrajet but there is no choke so makes
hard to start.......running like a dog atm lol
just like to know whats better to run my rochester quadrajet or a holly ie: 650
what are the pro and cons on 2

[wayne6ss]

THE Quad is a great carb , if properly sorted , could handle the 333 no problem !! and economical.

for simplicty the 600-650 holley would be easier to tune with jets on primary and vacume secondary plate holley would be 66 I ran a 350 on 59!!!

but each motor is different

[chev]

Ahhhhh,the old bucket debate.

Bring back the BUCKET.

Both carbs are great if tuned correctly. The Quaddy is very good if you know where all the tuning capabilities are built in. It has (on most quaddys) idle adjustment,progression adjustment,main adjustment,secondary butterfly adjustment,secondary needle adjustment,float adjustment=you get my drift.
Drop on a new Holley out of the box and you should be fairly close.
Work out what CFM the engine needs= CI x max RPM Divided by 3456.
ie 333x6000/3456=578cfm.
:goodjob:

[clubbie]

Can I make another suggestion?

Look at Barry Grant Mighty Demon

Clicky Here (http://www.barrygrant.com/demon/default.aspx?page=14)

[gmh308]

hi guy whats better to run i have a 308 stroked to a 333 it currently has
a torker manifold with a rochester quadrajet but there is no choke so makes
hard to start.......running like a dog atm lol
just like to know whats better to run my rochester quadrajet or a holly ie: 650
what are the pro and cons on 2

Mate like Chev says the Rochester is good when tuned right, but tuning requires good knowledge and an assortment of rods and jets and cams to get perfect.

Your Torker manifold is really designed for a square bore carb like the Holley, even if it may have the spreadbore bolt pattern like the QJet, and the squarebore pattern will give more balanced cylinder to cylinder mixture distribution at full song. Also mechanical secondaries in a double pumper vs vac secondaries will mean that you have complete command of the throttle.


I have a Holley 650 double pumper that did about 15,000km on my 308: with the choke!! sitting here, so PM me if you are interested.

Yes the engine needs around 580-600CFM, but going to a 650 ensures that the pressure drop across the carb is minimised and gives a bit of top end margin, and your QJet is around 650-700 if my memory serves me correctly anyway.

:)

[Desertws6]

hi guy whats better to run i have a 308 stroked to a 333 it currently has
a torker manifold with a rochester quadrajet but there is no choke so makes
hard to start.......running like a dog atm lol
just like to know whats better to run my rochester quadrajet or a holly ie: 650
what are the pro and cons on 2

I am running a Quadrajet on my Pontiac 326ci (bored, now at 331 ci) the carb runs great. It's the factory performance version with slots cut in the secondaries, and I had a choice of metering rods for the secondaries.
1. Economy
2. Normal
3. Performance
I chose #3 with no regrets, works very well.

Manifold is a factory Pontiac air-gap, sourced from a 67 GTO 400ci.

Cheers,
Steve

[SSV8TE]

In the past i have had quite a few holden V8's and ive had both the quaddies and the holleys. For the average joe the quaddies are easy to pull apart and play with things. One common fault on the quaddies was the old deteriorating float inside the fuel bowl. I had one that had a pin hole in it. Wasnt easy to see by the eye so with the engine flooding constantly i finaly by elimination of replacing parts in the carby found that fixed the fault.
The quaddies imo are great for their massive secondarys that really give you the slingshot feel when you kick them in.
Thumbs up for the quaddie from me but in saying this the hollies have a pretty long and good reputation. Many choices of cfm flowing carbs. Do a bit of searching on the different types ie vac secondary or mech secondary or double pumper to name some search titles.
And one other pointer is choose your cfm rateing wisely as chev said as bigger is not allways better with the old buckets.:lol:
Best of luck and i know mostly worthless info here but worth a thought.
Cheers,
Andy.

[Desertws6]

Ahhhhh,the old bucket debate.

Bring back the BUCKET.

Both carbs are great if tuned correctly. The Quaddy is very good if you know where all the tuning capabilities are built in. It has (on most quaddys) idle adjustment,progression adjustment,main adjustment,secondary butterfly adjustment,secondary needle adjustment,float adjustment=you get my drift.
Drop on a new Holley out of the box and you should be fairly close.
Work out what CFM the engine needs= CI x max RPM Divided by 3456.
ie 333x6000/3456=578cfm.
:goodjob:

Great idea Chev! or you could cheat like I do :lol:

Use this calculator :hide:
http://www.csgnetwork.com/cfmcalc.html

,Steve

[XUV]

A quaddy , no choke , cold melbourne mornings :goodjob:
shit . i've just stepped back to the late 80's ,
as I think I've had this debate before ........ fun times

If you want a hint of economy on the highway , stick with the quaddy :goodjob:

[planetdavo]

shit . i've just stepped back to the late 80's ,
as I think I've had this debate before ........ fun times

How did people debate stuff back then, pre-internet forums?
Did you tie a note onto the foot of a homing pigeon and tell it to fly to a few peoples houses?

[05guy]

How did people debate stuff back then, pre-internet forums?
Did you tie a note onto the foot of a homing pigeon and tell it to fly to a few peoples houses?

Sounds like planetdavo is onto it :goodjob:

[cross8 pat]

i have a simmilar engine (338) and have had a few 308s and have tried both holleys (650DP and 465) and quads and then i went to gas with a gas research twin throttle system. I would never go back. Its the best money i have ever spent, ever, its making 420fwhp and i get 550-580km from 75L of gas. Absoulutely no complaints at all.
Note: i built the engine to suit LPG so you may need a few tweaks to change yours over ie, compression, timing ect.

[XUV]

How did people debate stuff back then, pre-internet forums?
Did you tie a note onto the foot of a homing pigeon and tell it to fly to a few peoples houses?

'twas called a Pub , where ye could drink ale , smoke Dr Pat and have a slap'n'tickle with ye buxom bar wench ,
whilest having a hearty discussion about blue '08 vs red , just to be trumped by a black '04 :goodjob:

[gmh308]

How did people debate stuff back then, pre-internet forums?
Did you tie a note onto the foot of a homing pigeon and tell it to fly to a few peoples houses?

They didn't LOL.

There was only Carter, Rochester and Holley to choose from. Off the shelf performance was Holley. Use a factory Carter or Rochester on a performance plant? :doh:

Max power and simplicity was a correctly sized and tuned Holley. :)

No need to debate, it was a proven fact.

[spinr33]

If u get a holley get one with an electric choke ie on/off damn old school cables lol get stuck and then it floods when u try to drive it, argh remeber days of the old hq lol.
With the overall cost being low on these units why not buy one of each jet them both and see for urself its not really an expensive exercise.
Regards Rory