A buddy of mine just pulled the X-celelerator 7545 small single plane off of his 340. He is looking for a newer dual plane intake. I am running the RPM intake on the below 340 setup and he asked me if I wanted it for free.
I have seen where Hughes measured the RPM at 256cfm. It got me to thinking that my ported Sidewinders are 280cfm at .550", should I be looking at a small single plane instead of my current RPM. Both have similar rpm ranges but I can't find the average cfm of the Weiand to compare against my heads.

I know that the RPM and the Air Gap are good street intakes, but I am considering changing my HFT cam to a solid roller (street) this year. Should I at least grab this intake and put it on my shelf or just swap my RPM for his Weiand 7545 single plane for my street car. This is my toy and not a DD. Vacuum loss of 1hg or so is not an issue and I run a 3800 converter with 3:91's so this intake may be a better fit for my combo.
What do you Think?

Thanks

These are some notes that I found.

Ok,
A few months has passed and my buddy bought a dual plane to replace the 7545 on his 340. The 7545 is still sitting on his floor.. Should I pick it up or keep running my dual plane RPM with my current hydraulic FT cam?
I also have a Bullet .565" solid flat tappet coming and was wondering which of the two intakes would work best up to about 6250-6400rpms.
Thanks!

I'd pick it up & try it.

I've never tested a RPM air gap against a decent single plane but I have tested a BB with a Eddy Torker 2 against the Eddy RPM and again against a Mopar M1 single plane. The Torker 2 was the worst,20 to 30 HP behind both of the other two intakes from 2500RPM up to 7000 RPM, the RPM intake made more HP and torque below 5500 RPM than the M1 did but the M1 intake made more HP and torque above 5500 RPM
That was with the same carb and no jetting or timing changes within 4 hours of all three test
I ended up putting the RPM back on the motor after discussing those dyno results with the customer, he ended up liking that combination a lot
IHTHs

Thank you for the replies!
I may grab the intake just to have it on the shelf. I was told that I may lose vacuum at idle with the single plane intake.

Dave

I finally got my hands on this Weiand 7545 and I have some questions. It was designed for the 318/340/360 engines but how well would it work on a 340/418 stroker combo?
I still have my RPM intake (non air gap) and now this 7545 single plane on hand. The stroker combo would be apx 10.7 comp, 6k rpm shift points, 4K stall, 3:91 streeter.
Which intake would you use?

Thanks

Try both before YOU decide which one YOU like the best

I ran a X-cellerator on my aluminum headed 340 and liked it. Very good intake IMHO.

Given your stroker build, the converter stall and the rear end ratio, what have you got to lose in trying the single plane?

My thinking being: the RPM piece will most likely be better in the off-idle/mid-range "butt feel meter", so from a street manners perspective if that's what is most important to you I would probably keep the RPM.

However, given the other variables the single plane is what's going to net you the biggest bang for the buck, and what I mean is that WOT performance feel.

Case in point, I am in the process of going from a 238/244 Hughes flat tappet hydraulic cam, Performer RPM, 360 motor, 4K stall converter and 4.10 gear setup to a W2 408 stroker build, 240/248 hydraulic roller setup. The intake (somewhat by necessity, although I wasn't looking for a dual plane anyways) is getting switched to the Victor 2920 single plane.

My goal is: let the bigger cubes and the converter "power through" the street duty stuff but focus on the WOT performance of the combo, thus the single plane.

EDIT
====
Oh, almost left out the real-world experience. I had tossed my Holley Strip Dominator on as a replacement for the RPM piece once before. The car had a 2800 stall converter and 3.91 gear at that time. That single plane took out a good chunk of the bottom end response, that mattered to me in terms of street behaviour. So I went back to the RPM setup.

"" the converter stall and the rear end ratio, what have you got to lose in trying the single plane?""
""the RPM piece will most likely be better in the off-idle/mid-range "butt feel meter""
""let the bigger cubes and the converter "power through" the street duty stuff but focus on the WOT ""

Well said/written Diplomat!

Thank you everyone.

I used that single plane on a 360 build with stock heads, 8.5 to 1 cast pistons, and a 268 cam, with a holley 780. Starts with the touch of the key, and idles smooth a s a baby. Car has an 11" converter and 355 gears. drives perfect. All I had to do was up the idle feed restrictions to .035.

Please post before and after performance results. I'm assuming you've got 60', 1/8 and 1/4 mile times, and of course seat of the pants feel.

Fair enough...but that cam has a pile less duration than what I was running, which means that my vacum signal (which was about 6-7" @idle) was most likely a lot weaker than what you were seeing, thus impacting my off-idle response as well.

I get the idle feed changes (went through all that on my Carter TQ, numerous adjustments which I am comfortable stating all had the desired effects I was looking for), but at the end of the day, for my combo the RPM unit just delivered more of the bottom end I was prioritizing at that time.

Great point though for the OP, it all depends on how the individual components all come together and how they either add to, or detract from your intended goals!

Wasn't knocking the rpm at all. I was only trying to defend the Weiand. Heck the stock 318 2bbl intakes were single plane.There was a intake test in one of the magazines years ago, small block in a Duster. The Weiand was one of the intakes used in it.

Oh, sorry, I missed that. I saw your response to my post and thought you were commenting on the M1 single plane, that is the only single plane intake experience I have.

Although I do have a Torker 2 here, still BN in the box, but it seems that intake always shows a drop in torque and hp as compared to others, so I never tried that one out.

"Wasn't knocking the rpm at all. I was only trying to defend the Weiand. Heck the stock 318 2bbl intakes were single plane.There was a intake test in one of the magazines years ago, small block in a Duster. The Weiand was one of the intakes used in it."

The old design small plenum single plane manifolds actually do work very well. For decades the Torker was the gold standard for big and small mopars. Its when you put a Victor or Team G on a mild engine that the performance really suffers. The performer RPM is solid too- and is what I would run on a daily driver.

i have a small block torker intake i made several plenum divider plates for, but sold the car before i had a chance to try them.
it would have been interesting to see what, if any, effects they would have had on performance. an 850 T-quad was going to be used with this intake on a basically stock '79 cop engine [E-48, E-58, which designation describes this engine ?].