[PAUL K]

Originally Posted by carbking

The spacing Offy used for the carburetors is Pontiac spacing; compare it to the Pontiac SD designs to verify this.

The spacing Edelbrock used is small block Chevrolet spacing (can you say "one size fits all"?). Average cylinder fill density on this manifold is less than the Offy.

Jon.

Gotchya.....interesting

[PAUL K]

Originally Posted by Tom Vaught

The difference is well worth putting on the Offy 2x4 vs the Edelbrock intake.

That being said, IF it is a true street vehicle, put the 750 Q-jet on the engine and the drive will be great.

Tom V.

Thanks Tom, any additional information you can share comparing the Offy and Edelbrock 2x4 manifolds?

[1967Tempest]

Torker 2 and Brawler 850 DP with electric choke. I have a similar set-up with this intake and carb.

Invest in a tire company. That must be a fun car to drive.

[77 TRASHCAN]

Dave, how are you!!!
Oh man, thought you were headed to North Carolina! Florida is good!
Praying all is well with you and family!!!

[tom s]

Im looking forward to all 3 of my cars being dual quad cars soon!2 are now and hope the 428 RA V will be also.Tom

[RocktimusPryme]

Originally Posted by PAUL K

Performer RPM and the correct Quick Fuel carb with an electric choke. A properly set up QF carb with an electric choke is like EFI with less hassle and cost.

QF makes several models. I’m curious if you have one in mind that is far superior to others?


My own two cents as I have shared before. I feel the customized quadrajet is the best value in induction. A q jet can be build by several companies custom to your engine for between 5-600 bucks.

When you consider the best of the best Holley XPs (which I’m sure are great) start off the shelf for $700+ with no thought of your specific combo in mind, it seems a no brainer to me.

I will say I bought a billet Avenger for my Galaxie from eBays web store and have been very happy. Seems kinda a secret, but Holley has an eBay store that sells “refurbished” carbs. These are usually carbs that just got adjusted out of spec by the uninformed with nothing wrong with them. Holley puts them back to factory spec but can’t sell as new. So they are sold at a big discount. I got a $570 carb for I think $320.

[jeff chmura]

Hi Guys,
thanks for the advice....Ill try to answer all questions....
Paul K. got your PM.....I will be in touch in the near future...…
OK... this is a street driven car... I picked up the 428 as a disassembled long block from a fellow member here. Picked the KRE's and decided to have them ported.I went with the "041" clone because I had that same one in a '66 with the tri power M-21 3:90 combo and that car ran... At the time of the 462 build, I wanted to go hydraulic roller, but didn't have the funds. I have the Rhoads because the Crane flat tappet lifters that were bought with the cam have the Chevy style band. I wouldn't have the Rhoads if I knew what brand of HFT lifters are true Pontiac.
I went with the 2x4 setup this time around mainly due to "being different" because ALL GTO's came with tripower (being scarcastic). the 2x4 looks cool,but I know there's more with what I have now.
More than likely, i'm going to stick with the squarebore style mainly because I don't know the Q-jets that well.

[ponyakr]

"...i'm going to stick with the squarebore style..."

A guy on the GTO forum tested several carbs for his mild 400. The winner was a QF SS-680-VS.

https://www.gtoforum.com/f178/opinio...tml#post624025

https://www.gtoforum.com/f178/opinio...tml#post624121

This series comes in larger sizes. Maybe something like an SS-780-VS would be a good choice.

https://www.amazon.com/Quick-Fuel-Te.../dp/B003M96BHW

I can remember when the old 3310 Holley 780 vac sec, with downleg boosters, was a real popular street performance carb. I think these may have come from the factory on some BBC engines, back in the '60's.

https://www.ebay.com/itm/65-66-CHEVE...QAAOSwVKhcZDK5

But, I'm sure the Holley experts here will probably recommend a double pumper of some sort.

[77 TRASHCAN]

Jeff,
There's no mysteries with the flat tapper lifters. Correct Pontiac specific lifters are, and have been available, always..

The hydraulic roller lifters are another story. Paul knows his stuff, he can help you as needed.

[jeff chmura]

There is a bit of lost info with the flat tappet lifters also....case and point, I bought the Crane cam and lifters as a kit...then after reading all the hype about the Chevy lifters, I disassembled mine only to find out, they were infact the Chevy style ( low band)
FYI... I didn't see/have any problem with that style lifter, they semed to be oiling the top end properly,but I was concerned, so I switched them to Rhoads.

[jeff chmura]

Yakr,
Interesting.... You don't think a 750/780 wound be too small?
I'm asking because I have a 383 Chevy that really likes the 750 CFM.... I have a 700 on there now,and it's night and day

[ponyakr]

Originally Posted by jeff chmura

Yakr,
Interesting.... You don't think a 750/780 wound be too small?
I'm asking because I have a 383 Chevy that really likes the 750 CFM.... I have a 700 on there now,and it's night and day

As I've mentioned, I'm not a Holley expert, like some here are.

I'm going strictly by the results others have had, & my one Holley experience.

My car was a '74 Ventura. It had a 455 with #215 heads. Don't know what cam. Didn't sound radical, at all. Had a Torker 2 intake. I'm just assuming it is a 750cfm 3310, since it had straight leg boosters. Someone had added a rear metering block. I say assume, because someone has removed the choke tower. A quick change vac sec was added. I estimate the power at 400hp/500 torque. hp could have been slightly higher. Had a TH400 with a 10" converter, & 4.11 gears. By launching from a 2000rpm powerbrake, it had 1.60 60' times, and ran a best of 7.33, on our local 1/8 mile track. Felt to me like it pulled hard all the way thru. But, I know that many guys here will say their street car is much quicker.

I had a LOT more experience with 750cfm Q-jets. With 455 engines, small chamber, big valve, iron heads, 041 clone cam/Rhoads lifters, 750 Q-jets, factory intakes, TH400 with 13" factory converters, we ran 60' times in the 1.70's, & ET's in the 12's, down to a best of 11.82, in a '67 Bird. It had 4.11 gears, whereas our other 1/4 mile cars had 3.55-3.73 gears. Again, not quick at all, by today's standards.

Would my cars have run quicker with an 800 or 850 Holley ? I doubt it. But, I have no way to prove it.

Another thing that makes me think a 750-780 might be big enuff is the fact that so many 750 Q-jets are running low 9's on 1/4 mile tracks, on the alum head 428 engines. Also lots of 750 Q-jet/iron intake equipped engines, including 455's, running 10's, in NHRA legal Stockers.

And, for those BBC powered Chevy models that came with a 780 Holley, those Stockers are also running 10's. Some have probably run in the 9's. They certainly run 9's in Super Stock cars. Would all these cars run quicker with an 850 DP ? Maybe some would.

I suppose that the ONLY way you could possibly know exactly what carb would be the best one for your particular car is to test LOTS of different carbs, all correctly tuned for your set-up. Most guys don't have the money to test lots of carbs. But, I suppose there have been LOTS of guys buy a bigger carb than they need, just as many have bought a bigger cam than the need, thinking the bigger parts would give there car more power.

I know a guy who likes the Dominator type carbs, on 455 & bigger engines. And he's built some pretty quick cars. SMI sells a street version.

https://www.smicarburetor.com/produc...6/productID/50

Would be good if you could borrow some good Holley type carbs, in different sizes, to test.

[TCSGTO]

Originally Posted by RocktimusPryme

I will say I bought a billet Avenger for my Galaxie from eBays web store and have been very happy. Seems kinda a secret, but Holley has an eBay store that sells “refurbished” carbs. These are usually carbs that just got adjusted out of spec by the uninformed with nothing wrong with them. Holley puts them back to factory spec but can’t sell as new. So they are sold at a big discount. I got a $570 carb for I think $320.

They do have some good deals on there.
https://www.ebay.com/itm/Holley-0-80...IAAOSw1x1UNG-2
https://www.ebay.com/itm/Holley-0-76...4AAOSwrb5XPf~0
https://www.ebay.com/itm/QFT-SS-750-...QAAOSwhQhY2~nC
https://www.ebay.com/itm/QFT-BD-850-...4AAOSwPOhaU9WS

[RocktimusPryme]

Yeah I’ve tried to let people in on that, as it seems it’s not widely known. Sorta subject to availability because it’s always changing. But the deals are strong. Holley, quickfuel, and a few others are listed regularly.

Mine came looking brand new. The only thing that was off about it was the accessory kit. It was basically just put in a ziplock bag. But that rubber line setup that comes with the avengers suck anyway. I think I’m going to buy a hardline kit.

[i82much]

Originally Posted by jeff chmura

Hi All,
I have a 2x4 setup on my car now and I want to change to a 4bbl setup.
I have a .60 over 428 with a 455 crank, (462)
KRE D ports ported to 295 cfm 10.5 CR.
I have a Crane HFT 041 clone cam with HS 1.5 roller rockers. Rhoads v max lifters. 6500 redline.
This setup is in a 65 GTO M23W 4 speed (2.59 1st gear)with a 3:31 12 bolt, P/S,P/B,A/C.
I have now the Edelbrock 2x4 setup with the p65 manifold and the 1404 carbs.
It runs good, but I know there is room in the intake Dept. for a bit more.
I would like to stay with a carb that has an electric choke..... Maybe 850 CFM?
Intake wise, performer RPM or Torker II?
Down the road will more than likely change out the cam, (suggestions welcome also)but for now,would like to get the intake dialed it...

Thanks Jeff

Our cars are very similar. I have the super wide ratio trans with a 3.55 gear in a 65 GTO with a 505 CID IA2 engine, 10:1 with OF cam and 87 cc e-heads.

I'd suggest contacting Paul K for a Quick Fuel 850 double pumper with the black diamond coating. I love mine, and the price wasn't bad either.

Do some research on how carbs are rated - an old 4781 Holley 850 or an 850 quick fuel double pumper are very similar dimensionally to a 1000 HP holley. The different lineups are rated at different pressures and you have to do some research to compare apples to apples.

I've run both T2 and the RPM and wound up with the RPM. I didn't notice much difference, I just decided I wanted more of a street car than a race car so I stuck with the dual plane.

[NeighborsComplaint]

Originally Posted by RocktimusPryme

Yeah I’ve tried to let people in on that, as it seems it’s not widely known. Sorta subject to availability because it’s always changing. But the deals are strong. Holley, quickfuel, and a few others are listed regularly.

Mine came looking brand new. The only thing that was off about it was the accessory kit. It was basically just put in a ziplock bag. But that rubber line setup that comes with the avengers suck anyway. I think I’m going to buy a hardline kit.

This guy knows about it. I picked a Holley 750 vac secondaries, w. echoke for $249.99 that looked absolutely new to replace my 770 Street Avenger that had a warped base plate (binding primary throttle plates would not return to idle). The 750 runs fine on my 455.

I ran an 850 for a time that came with the car. I was fortunate to have had a dialogue with Pete McCarthy who said "Your 455 will fine with a 750 or 850. The 850 will just use more gas."

[scott70]

The holleys to me are easier to work on but the qjet is my favorite street carb when right. Also on 2 recent separate Dyno days my cliff jet 7040267 carb made 7 more HP one time and 5 hp more the next time compared to their 850 Holley Dyno carb that was also rejetted during the pulls but made no difference.

[tom s]

I tried a double pumper for a street car,HATED it,went back to vac secondary.Tom

[i82much]

Originally Posted by tom s

I tried a double pumper for a street car,HATED it,went back to vac secondary.Tom

stick?

[tom s]

Yep,bought it on purpose to see what all the hopla was about one.I would like it for racing forsure but did not like it on the street,im OLD.Tom