[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

[jamaca85]

performer rpm, a nice 850 holley.. thats it.. dont do the q jet and cast iron intake thing... but the choice is yours...

[tom s]

Do the RPM but do the QJ.Tom

[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.

[jeff chmura]

So the RPM looks like the manifold of choice......
Paul K... What CFM ?

Also, side question with the 4150 style choices available, (quick fuel, Bower,demon, etc)do the Holley jets,power valves,etc interchange?
Jeff

[GTOLou]

Originally Posted by tom s

Do the RPM but do the QJ.Tom

this.

[PAUL K]

Originally Posted by jeff chmura

So the RPM looks like the manifold of choice......
Paul K... What CFM ?

Also, side question with the 4150 style choices available, (quick fuel, Bower,demon, etc)do the Holley jets,power valves,etc interchange?
Jeff

Yes, tuning parts interchange. Sent you a PM

[carbking]

It is too late now, but had you asked about dual quads before you put on what you have, you wouldn't be asking about changing! That combination leaves a ton on the table!

As to your current question:

Circle track or road course racing - Holley square bore (unless you are a Carter specialist )
Drag racing - the brand you feel most comfortable with modifying; square or spread bore
Street - spread bore, either a Cliff Ruggles prepared Q-Jet or a Carter Thermoquad

Manifold - street - I personally use the 455 HO aluminum.

Jon.

[footjoy]

Will the rpm fit under the hood?

Greg

[ponyakr]

I prefer a Q-jet.

But, if you are set on a square bore Holley type carb, why not go with the Torker 2 ? It has been posted that the single plane works just fine in 455 & larger engines.

I bought a 455 powered Ventura bracket car, which had a T-2 & 750 vac sec Holley. Seemed to do OK. Ran 7.30's on our 1/8 mile track. Should work on the street.

If you don't wanna run an exhaust crossover, you might consider one of the Chinese single planes. They have a dual pattern carb mount. So, just as with the RPM, you could use either a Q-jet or square bore.

I think Cliff has posted here many times that one of his Q-jets ran about the same as a Holley, but had better street manners & fuel mileage. And, there are lots of 9 sec drag cars running 750 Q-jets, & a few running 8's. I think Cliff also has some Q-jets running quick, on some of the F.A.S.T. series cars.

But, there are still LOTS of guys who consider all Q-jets "quadrajunk", and consider a sqarebore Holley type carb standard equip for any performance engine.

[Steve C.]

I'd be curious if this is for street only or including occasional drag strip use as well.


.

[Bruce Meyer]

Torker 2 with a Holley 750 DP (4150).

[PAUL K]

Originally Posted by Bruce Meyer

Torker 2 with a Holley 750 DP (4150).

Good choice

[PAUL K]

Originally Posted by carbking

It is too late now, but had you asked about dual quads before you put on what you have, you wouldn't be asking about changing! That combination leaves a ton on the table!



Jon.

Jon, you think properly set up the Edelbrock 2x4 would out perform a well set up single fo'?

[389]

If street, I would change the cam to Nunzis version of the 068 or an 068, change the rhoads to Johnson lifters and use the stock Quadrajet intake with a Quadrajet. You could cut all the crossover iron off the intake and make it as light as the aluminums.. Then pick up a stock single point distributor and use it to trigger a MSD6AL or some other CD box. Remember I am talking street and not drag racing. You have the right cam for drag racing except I would swap lifters using a stick..

Before changing anything, I would get a stock single point distributor remove the springs to the advance weights and run locked timing . Mark the balancer at 30 BTDC and try full advance. The points spring would also act as a start retard.. Then run an MSD6AL box and a nice coil for juice.. Remove the vacuum advance.
I straightened out a few lumpy street/drag motors using this old Smokey Y trick.. I got the idea from a "Hey Smokey" article.. If it brings enough bottom end back swap the lifters to Johnsons and get rid of the tickers. I had them once, I blame them for my tinnitus... They are the worst thing for a street motor. the idle is always changing due to oil thickness amount other things, the engine never stayed the same using them, I was always tuning, I used to carry a little screwdriver with a case I made from a change purse with me lol...

People go to crazy with durations and compressions on street motors anymore.. I remember a local guy pulled a 455 from a demolished, junked 70 Grand Prix (068 cam), put it his 65 tempest and was turning 11.99 the next day at the drag strip..

[Steve C.]

It's 462 cubic inches with a 230 degree HFT cam.

If changed to the Performer RPM intake and Q-jet. Somewhat similar....

http://www.pontiacstreetperformance....d455MikeG.html

Peak power at only 5300 rpm here.

"What I see, and to this day I don't know why, is folks not putting near enough cam in 455 engine builds. They buy into the BS that installing a smaller cam makes more "low end torque", and better street manners. They forget that it is a 455 CID engine, and some of the same folks port the factory heads or go to better flowing aftermarket aluminum heads."
Cliff Ruggles


.

[carbking]

Originally Posted by PAUL K

Jon, you think properly set up the Edelbrock 2x4 would out perform a well set up single fo'?

No, but an Offy with genuine Carters will, but not by much.

The setup the OP listed would work, for a while, on a 400 bowtie. Whichever of the suggestions in this thread the OP chooses, he will be amazed at the difference from what he currently has.

Jon.

[PAUL K]

Originally Posted by carbking

No, but an Offy with genuine Carters will, but not by much.

The setup the OP listed would work, for a while, on a 400 bowtie. Whichever of the suggestions in this thread the OP chooses, he will be amazed at the difference from what he currently has.

Jon.

Okay thanks. You feel the Offy 2x4 is a better choice over the Edelbrock 2x4?

[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.

[Tom Vaught]

Originally Posted by PAUL K

Okay thanks. You feel the Offy 2x4 is a better choice over the Edelbrock 2x4?

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.