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As the title says, do you guys know of any spread bore single plane intakes? Hoping to keep my quadrajet, but I want to try out a single plane for a couple reasons. Don't want to use a carb adapter for hood clearance and performance reasons.
The only one I ever remember was the Holley Street Dominator "Z" intake designed by no other than Zora himself......have not seen one in a million years. I think.....Weiand made an X-cellerator a long time ago with a divider in it that would mount a spread bore......but my memory is fuzzy.
There is really no reason to run a single plane with a Q=Jet these days as a good dual plane will handle 500+ horses.......
Look at a Performer RPM Q-Jet intake.....unless you have to have a single plane....then you are hitting the swap meet....
Weiand Team G 7525 if you can find one. I found one on CL and it is sitting on shelf in my garage. I ended up running the Performer RPM Q-Jet when I had a small block.
Last edited by SteveG75; Aug 16, 2017 at 09:28 PM.
Here is a pic. Spreadbore, EGR, big ports. It was supposed to be pretty good back in the day.
That's the only one I can think of, but I definitely wouldn't call the ports big. The outlets at the intake runner are similar in size to an Edelbrock Performer. Compared to a 7530 or a Perf RPM, they're tiny.
I ran one w/ a Q-Jet for a little while, but didn't see huge perf gains vs my ZZ4 manifold. This was on my previous engine.
Last edited by Shark Racer; Aug 17, 2017 at 01:42 AM.
I'm currently running a Performer RPM Qjet actually.
The biggest problem with it is I am running Brodix IK200 heads that have an intake port size of 2.20 x 1.31 and the Performer RPM intake only has a port size of 1.92 x 1.16. I have never done any porting before, but just looking at the Performer RPM it doesn't look like there is enough "meat" around the ports to widen them enough to match up to my heads. As it sits now, it's a pretty bad size mismatch. And I've always wanted to give a single plane intake a shot, so I was hoping to find a cheap single plane that has bigger ports, or that I can try porting myself instead of hacking up my Performer RPM.
I'm currently running a Performer RPM Qjet actually.
The biggest problem with it is I am running Brodix IK200 heads that have an intake port size of 2.20 x 1.31 and the Performer RPM intake only has a port size of 1.92 x 1.16. I have never done any porting before, but just looking at the Performer RPM it doesn't look like there is enough "meat" around the ports to widen them enough to match up to my heads. As it sits now, it's a pretty bad size mismatch. And I've always wanted to give a single plane intake a shot, so I was hoping to find a cheap single plane that has bigger ports, or that I can try porting myself instead of hacking up my Performer RPM.
I understand now....
None of the above mentioned manifolds flow enough for the IK heads....
A 7520 Team G or Vic Jr. will flow a lot better but you will have to adapt it....if you use an open aluminum adapter and blend it in....it will work very well and no loss of power.....
I have an old Vic Jr. that is ported for a 1406 gasket for cheap if would like to try it.....it needs soda blasting to remove paint but otherwise intact.....
Let me know if you are interested.
Does anyone know if the Performer RPM CAN be ported to a 1206 gasket? I'll take a picture tonight, but I seem to remember that the intake just BARELY covers the Brodix heads intake port, so I would think there isn't room to port it out.
Obviously I'd prefer to make my Performer RPM work so I don't have to switch intakes or use a carb adapter, but if it won't work then I'll probably hit up Jebby about his Victor Jr.
While researching this I came across a speedtalk thread that mentioned Edelbrock 2693 and that a lot of big time drag racers use it.
Not much info on Edelbrocks website other than it 'repositions the carb'
I used one of these in the early 90's to mount a Mercruser Q-jet to a series one Torker (Tarantula) on a real LT-1 350 (355).
It was in a 63' Impala and ran a 175 shot of NOS as well....ran VERY well....12's spinning through first.....
Street manners were spot on too....just make sure to blend it in.
Part way down the page it says that you can use that thick heat insulating gasket INSTEAD of an adapter. But how would that work? Aren't the bolt patterns different between spreadbore and square bore?
Part way down the page it says that you can use that thick heat insulating gasket INSTEAD of an adapter. But how would that work? Aren't the bolt patterns different between spreadbore and square bore?
That gasket wont work as its only for the Holley square pattern. And yes, bolt patterns are different.
What does that Team G intake give me that the Vic Jr. doesn't? Besides being a spreadbore pattern.
So I did some checking around, and there doesn't seem to be a single Dual Plane intake that fits the Fel Pro 1206 gasket. The only intakes with ports that big are single plane, so I'm probably stuck with a single plane.
What does that Team G intake give me that the Vic Jr. doesn't? Besides being a spreadbore pattern.
So I did some checking around, and there doesn't seem to be a single Dual Plane intake that fits the Fel Pro 1206 gasket. The only intakes with ports that big are single plane, so I'm probably stuck with a single plane.
Keep researching. But I think a lot of the newer dual planes can be port matched to the 1206.
As far as the adaptors go...I really don't know. Edelbrock description says carb is 'repostioned' so that may explain the difference in price.
I can't seem to find any dual planes (at least not spreadbore ones) that can match to a 1206 gasket.
What gasket does that Weiand 7525 you posted use? I can't seem to find any info on it.
I went through my notes and found the measurement guide that I have.
The 7525 has a slightly smaller port (1.15x1.94) than a Performer RPM (1.16x1.92). Looks like I was wrong when comparing it to the base Performer(1.14x1.88) - it's slightly smaller than, but more comparable to the Perf RPM.
I looked at Edelbrock and Weiand's offerings but, unfortunately, can't find anything larger than the Perf RPM.
I went through my notes and found the measurement guide that I have.
The 7525 has a slightly smaller port (1.15x1.94) than a Performer RPM (1.16x1.92). Looks like I was wrong when comparing it to the base Performer(1.14x1.88) - it's slightly smaller than, but more comparable to the Perf RPM.
I looked at Edelbrock and Weiand's offerings but, unfortunately, can't find anything larger than the Perf RPM.
That's what I'm coming up with too. I went ahead and bought that Vic. Jr. off of Jebby since he already has it ported to a 1206 gasket to see if it will line up better. Unfortunately that means I need to use a carb adapter so it probably won't all fit under my stock hood. But I can at least test it and see how well it runs with the single plane, then figure out the hood clearance situation.
Any other intake suggestions are still welcome! Still trying to find an intake that can fit a 1206 gasket, preferably spread bore.
From: Las Vegas - Just stop perpetuating myths please.
Offenhauser 6064! Summit sells them for under $400. Maybe Jeg's too. They may have to back order as offenhauser is now pretty small business and you probably can't order direct. Good products though am I wouldn't hesitate to use one. Kinda cool and unique I think. You will have to download a offenhauser catalogue from someone to see a picture of one.
Spread Bore Single Plane intakes
