Weiand Stealth, Edelbrock Performer RPM, or Professional Products Typhoon?

Boss427 · 03-19-2010, 05:58 PM

I'm building a 427W Stroker using Dart's SHP, 9.5" Deck, 4.125" Bore Block for Street/Show Purposes.

My 1970 Mustang currently has a "Big-Block" Shaker Assembly (3/8 of an inch "Shorter" than the "Small-Block" Shaker Assembly) on my "Stock" 351W and I'm using an Edelbrock Performer Intake (4.075" Carb Pad Height)

I wanted to go with an Edelbrock Performer RPM Air Gap Intake on the 427W Stroker; however, I'll end up with a Hood Clearance issue using the Shaker Setup.

With the "Big-Block" Shaker Assembly, looks like I'll be able to go with (3) possible Intakes:

1. Weiand Stealth
a. Part #8023
b. Port 1.82" x 1.05"
c. "Front" Side Carb Height (A) 4.37"
d. "Back" Side Carb Height (B) 5.06"
e. Carb Pad Height 4.715" ((A+B)/2)
f. RPM Range 0 - 6,000
g. Recommended Carb 650cfm, 670cfm
h. Price $189.99 (Summit Racing)

2. Edelbrock Performer RPM
a. Part #7181
b. Port 1.86" x 1.12"
c. "Front" Side Carb Height (A) 4.30"
d. "Back" Side Carb Height (B) 5.30"
e. Carb Pad Height 4.800" ((A+B)/2)
f. RPM Range 1,500 - 6,000
g. Recommended Carb 650cfm to 800cfm
h. Price $199.99 (Summit Racing)

3. Professional Products Typhoon
a. Part #54023
b. Port 1.87" x 1.06"
c. "Front" Side Carb Height (A) ?"
d. "Back" Side Carb Height (B) 5.12"
e. Carb Pad Height ?" ((A+B)/2)
f. RPM Range 0 - 6,800
g. Recommended Carb 600cfm to 850cfm
h. Price $180.95 (Summit Racing)

My initial instinct was to "Stick" with Edelbrock since I'm currently using the Performer Intake on my "Stock" 351W.....and go with the Performer RPM; however, I thought I'd solicit input from others who might have knowledge of the other (2) products, i.e., Weiand Stealth and Professional Products Typhoon.

"A True Friend, would never let his Buddy drive a Chevy"

slow-poke · 03-19-2010, 07:06 PM

I used the stealth on my old 393c.i. stroked Windsor. Good manifold, but you have a lot of cubes to feed. If you use the Stealth consider cutting down the center plenum about an inch for a bit more flow. Don't go smaller than 750cfm

1109RWHP · 03-19-2010, 08:13 PM

Go with the Edelbrock as 1st choice and the Weiand second. Forget the Typhoon, it is just a Chinese rip off of the Edelbrock.

trkpny2 · 03-20-2010, 10:42 AM

+1 as far as I'm concerned about Edelbrock as first choice and Weiand for second choice. There is NO way you should support a chinese ripoff company when you can support the USA. Edelbrock is the one responsible for the development of the manifold and its because of their R&D that its out there. Weiand is a good second choice (tied for first even) both have good flow numbers and good castings. Stick with the USA!

GT289 · 03-20-2010, 11:58 AM

Well said about Edelbrock. Quality products made in the USA.
Vic's business ethic is 1st class all the way (which I've had 1st hand experience with).
My vote is for Edelbrock.

htwheelz67 · 03-20-2010, 12:02 PM

corection, the typhoon is a ripoff of the stealth. at least the 351w version.

6t9mach1 · 03-20-2010, 12:14 PM

Any of those intakes are going to severly choke your motor unless you dont plan on spinning it any higher than 5500 rpms. What cam are you running? Those rpm rating are for a 351, not a 427. A Vic Jr. would be bare minimum for a 427cid motor IMO. How about running adjustable motor mounts? You would be able to drop the motor 1/2" or so gaining you the clearance you need.

JonK · 03-20-2010, 12:19 PM

Can't comment on the edelbrock as I haven't used them but I really like the Weiand stealth I have, here's the info. sheet on it, they claim to run up to 6800rpm:
http://www.holley.com/data/Products/Technical/W535.pdf

Maybe do a search for engine tests with airflow numbers with your heads and either intake.
Jon

sportsroof69 · 03-20-2010, 03:09 PM

The Stealth is the best of the three you listed. If you could use the adjustable mounts like 6t9mach1 mentioned, you may be able to squeeze the RPM air gap in there, but it's comparable to the Stealth. The Performer RPM that you have listed as an option would really hold you back. It's not much more than an aluminum stock replacement. All of them are going to restrict you, but the Stealth is the best of the 3 mentioned.

6t9mach1 · 03-20-2010, 05:21 PM

The Edelbrock Air Gap is not much different from the RPM except for the "air gap" feature which is like that of the Vic Jr. and Super Vic. Its rpm range with a 351 is still 1500-6500. No sense in getting the adjustable mounts to just install an Air Gap. A big motor like this will not get the air it needs with an OTB dual plane intake manifold.

buckeyedemon · 03-20-2010, 09:10 PM

why limit yourself. this is a victor junior sitting on a windsor block.

if you still have everything together, stick some shims under the carb to model the different intakes. it's more than the "average" carb height, the angle can make a huge difference.

Boss427 · 03-21-2010, 02:41 PM

Quote:

Originally Posted by buckeyedemon

why limit yourself. this is a victor junior sitting on a windsor block.

if you still have everything together, stick some shims under the carb to model the different intakes. it's more than the "average" carb height, the angle can make a huge difference.

WOW......how in the world did you get a Vic. Jr. to work with the Shaker?

My "Stock" Performer is 4.075" Pad Height
An Edelbrock Performer RPM is 4.8" Pad Height
An Edelbrock Performer RPM Air Gap is 5.75" Pad Height
A Vic. Jr is 5.75" Pad Height

It looks like I "Barely" have enough room to go from a Performer Setup to a Performer RPM Setup (Difference of 0.725"). To go with an Air Gap or Vic Jr, I'd need almost an additional 1.00" (0.950" to be exact)....

Did you "Re-Design" or "Build" a custom Shaker Assembly?.......or did you use "Adjustable" Engine Mounts to make this work?

A couple of other thoughts on this matter....and I'd appreciate more feedback:

1. The car will "Only" be used for Street/Show Use, so I don't see the need for a Vic Jr. (I would if I was planning to race it)

2. I have a 3.50:1 Posi 9" Rear with a C4 3-Speed Transmission, 15 Wheels with a "Total" Tire Diameter of 26". I do 60% highway driving and 40% street driving, and at 60mph I'm pulling about 3,100rpms. I plan to change the Convert to a 2,500rpm to 2,800rpm Stall so the Converter is "Locked" up at highway speeds.

Would it make better sense to go 408 (4.00" Stroke, 4.030" Bore) versus a 427 (4.00" Stroke, 4.125" Bore) if I plan to use either the Stealth or the Performer RPM and a 770cfm Avenger (Electric Choke/Vacuum Secondary)?

I thought about "Milling" 1/4" off the Top of the Intake Manifold (If I go with the Air Gap) to get some extra clearance for the Shaker Setup, but I"m not sure I want to through the effort........I will look into the "Adjustable" Engine Mounts though......that seems like a reasonable compromise; however, the Vic. Jr. seems a "Little" overkill for a Street/Show Car.

I appreciate ALL of the feedback......any further opinions would be greatly appreciated....

"A True Friend would Never let His buddy drive a Chevy"

6t9mach1 · 03-21-2010, 03:23 PM

Quote:

the Vic. Jr. seems a "Little" overkill for a Street/Show Car.

How is a Vic Jr. overkill?

Quote:

The car will "Only" be used for Street/Show Use, so I don't see the need for a Vic Jr. (I would if I was planning to race it)

An engine needs a certain amount of air to perform; it doesnt care if it is on the street or the strip. Why build a 427cid motor if you did not care in the slightest about performance? Running a dual plane intake on the motor will be like trying to suck a watermellon through a straw.

buckeyedemon · 03-21-2010, 05:07 PM

it took serious modifications to the base, removal of some of the ribbing and bracketry in the midplate and 1/2" drop mounts. i had shaved 1/4" off the victor but ended up adding a 1/4" spacer back in. it internally has a 14X2.83" round filter.

the base you see started life as a 428 shaker base as well.

if taking the intake to the machine shop to get 1/4" milled is too much effort then the drop mounts will most certainly be too much effort. drop mounts can end up impacting a lot of other things, like the clutch linkage, fan, engine crossmember, steering linkage, etc...

it doesn't make sense to me to put a performer intake on a dart block.

i'm not sure that with 1/2" drop mounts only that an Air Gap would fit without shaker mods. it's too bad the shaker is such a space limitation to these builds. it seems to have resulted in so many people detuning their engines...

good luck in your build.

Boss427 · 03-21-2010, 09:19 PM

Quote:

Originally Posted by slow-poke

I used the stealth on my old 393c.i. stroked Windsor. Good manifold, but you have a lot of cubes to feed. If you use the Stealth consider cutting down the center plenum about an inch for a bit more flow. Don't go smaller than 750cfm

On your "Old" 393c.i., you said you used a Stealth Intake. What Carb did you use (Manufacturer, Model #)?

On your "Current" 408c.i., what Intake and Carb are you running?

Perhaps I've been looking at this the wrong way.......If I go with the 427W, Vic Jr seems the way to go; however, there will be potentially a lot of modification to get me completey there (Engine Mounts....possible other issues with Engine Mounts, etc...)

If I go with a 408c.i., perhaps the Dual Plane will "Not" be so "Restrictive".....at least not as "Restrictive" as it would be with a 427W??

I think the worst mistake I made was getting this car with the Shaker Assembly.......it's definitely "Not" optimum for High Performance Upgrades....