Webers for 427 WINDSOR

[ERA Chas]

I'm posting for a friend. He's built a 427 with solid roller cam in the mid .600 range, 108 LSA, with heads flowing 315/210.

Can anyone supply a baseline tune for 48 IDA's, including choke size? The car is an early Mustang of about 3000 pounds.

Thanks,

[RedBarchetta]

Wow, that's a lopey cam (108 LSA) for Webers. I'm going to watch this thread close and see what the experts recommend. I want to learn more about these carbs (even though I can't afford them at the moment).

-Dean

[onefastmustang]

Originally Posted by RedBarchetta

Wow, that's a lopey cam (108 LSA) for Webers. I'm going to watch this thread close and see what the experts recommend. I want to learn more about these carbs (even though I can't afford them at the moment).

-Dean

Well if I get mad at mine again you can find them at the bottom of my driveway with a FREE sign..

[RedBarchetta]

OFM, your set-up looks great. First dibs when you decide to go back to a 4bbl.

-Dean

[ERA Chas]

Should I conclude that there are no 427 Windsor Weber guys-only 302 and 331 guys??

Any general Weber knowledge for a similar situation would be appreciated here...

[onefastmustang]

I have a 395 engine running webers. I am thinking about rebuilding it to a 427. If I was you I would hit up steve at Top end performance or the guys at Pierce manifolds. they both seem quite knowledgable and could help.

[ERA Chas]

Originally Posted by onefastmustang

I have a 395 engine running webers. I am thinking about rebuilding it to a 427. If I was you I would hit up steve at Top end performance or the guys at Pierce manifolds. they both seem quite knowledgable and could help.

Thanks for a reply OFM. Care to share your cam and carb tune? 395 is closer to this situation than 331's...

[onefastmustang]

My cam card is in my gallery.. It is a roller cam from Keith Craft. I will send my jet sizes as soon as I can find my notebook in that messy garage of mine.

[ERA Chas]

Thanks OFM.
The cam seems very Weber-friendly. Mild duration and lift and a good amount of separation. Does it run cleanly?

Appreciate your sharing.

[Wayne Presley]

Chas,
is this a 427W motor? What are the cam specs (advertised duration) with opening and closing degrees? Have the webers been modified with a third transfer port?

[ERA Chas]

Wayne,
Yes it's a 427. I only know what I posted in #1. The Webers have not arrived yet but I think they will be in a generic state of tune. I doubt they have a transfer port mod out of box but if you can elaborate on what that accomplishes it would be helpful.

Really hoping for the experiences of a guy (like OFM) with a near 427 as displacement probably makes a notable difference.

[Wayne Presley]

Where did you get the webers? The IDA's come with 2 transfer ports to transition from the idle circuit to the mains. Redline drills a third hole to supply just a bit more fuel to help them run smoother. I really need the cam specs to tell you if it will work with the Webers. It will run very well above 3000 rpm but around town manners could be poor or worse.

[ERA Chas]

Wayne,
I won't have the exact cam specs until tomorrow. Will post when I do.

[PANAVIA]

There is a huge dependency on the Camshaft for webbers to work right.

If the cam was not ground by someone who was specifically considering vacuum requirements of webbers in its design, then the carbs will not work to their potential.

I would contact COMP cams and ask to speak to a specialist and have port data , combustion chamber data and compression data available.

When ford ran these at Lemans , they had teams of people working on them for months, and they never had to sit at idle in the drive through window at In-N-Out burger.

--so if it takes a bit of work and possibly some revisions once installed, consider your self lucky.

Steve

[ERA Chas]

Just got some specs and find my original info was mistaken.

The cam is a solid roller, 578" x .596", 255 x 260 @ .050" and 114 LSA. The head data is correct plus 2.08" x 1.60" valves.

The car is a little lighter at 2800.

[PANAVIA]

That should be a Good High Vacuum CAM. -= should work well.

[ERA Chas]

Thanks for the feedback Steve.

[RedBarchetta]

Originally Posted by ERA Chas

...specs...255 x 260 @ .050" and 114 LSA...

Originally Posted by PANAVIA

That should be a Good High Vacuum CAM. -= should work well.

Originally Posted by Wayne Presley

The IDA's come with 2 transfer ports to transition from the idle circuit to the mains. Redline drills a third hole to supply just a bit more fuel to help them run smoother.

Some more questions for Steve and the other experts here:
1. So even with a 255 and 260 int/exh duration, the 114 LSA vacuum signal is enough to offset that and promote a smoother idle/transition?
2. How much does the Redline "band-aid" of adding a third hole offset the negative effects of, say, using a 110 LSA cam?
3. Curious as to how many guys end up installing a vacuum pump to feed their power brakes?

Thanks!...Great thread BTW.

-Dean

[ERA Chas]

Originally Posted by RedBarchetta

2. How much does the Redline "band-aid" of adding a third hole offset the negative effects of, say, using a 110 LSA cam?
3. Curious as to how many guys end up installing a vacuum pump to feed their power brakes?

Thanks!...Great thread BTW.

-Dean

Dean,
These are great questions. At least now I have a clue about the '3rd hole' mystery.

Apparently, there are not many (or any) stroker Windsor, Weber- users out there, or 427 sized FE Webers in use that can shed light on this.

600+views, very few replies.

[Tony Ripepi]

Hello All,

These are the specs for my Dart Aluminum 427 with webers installed in the SPF GT 40.

Block: Dart Aluminum 351 Crankshaft: Eagle
Number 595FA Design Description Forged/Nitrided
Finished Bore 4.1245" Stroke 4.000
Deck Height 9.5" Main Journal 2.7445"
Oil Restrictors/size Restrict Lifter bore 2- .125" Rod Journal 2.985"
Rod Clearance 0.003"
Pistons: JE SRP Main Clearance 0.0025"
Mfg. Part # 231596 Rod Side Clearance 0.018"
Description Forged Axial Thrust 0.006"
Dome Volume 19cc (Dish) Balance Internal
Skirt Dimension 4.120"
Skirt/Cylinder Clearance .005" Cylinder Heads: Edlebrock
Pin Diameter/Length .927/2.750" Design Description Victor Jr.
Piston/pin Weight 435.5/447gr Final Chamber Volume 62.5cc
Runner Volume 210
Piston Rings: SpeedPro PlasmaMoly Intake Valves 2.050
Top Land gap/backspace .001"/.010" Exhaust Valves 1.600
2nd Land gap/backspace .001"/.010" Valve Seats Stellite
Top Ring Gap .018" Valve Spring Make Edlebrock stock
Bottom Ring Gap .022" Valve Spring Dia. 1.450"
Installed Height 1.900"
Connecting Rods: Scat Pressure @ Seat 135
Design/Type Forged "H" beam Pressure @ Full Lift* 360
Length 6.250" Compression Ratio: 10.8:1
Wt. Top/Bottom/Total 192/447/639

Camshaft: Engle Valvetrain: T&D
Type Hydraulic Roller Rockers/Ratio 1.6:1 Pedestal Mount
Exhaust Lift*/Duration .549"/291 Lifters Crane Hyd. Roller 36532
Intake Lift*/Duration 563"/281 Pushrod length 6.200"
Lobe sep. angle 112
Timing as installed @ 0.050" 10/47/58/8 Induction: Naturally aspirated
Manifold Weber
Blower N/A
Fuel System Weber 48 IDA

Flywheel: McLeod 463100 steel Ignition: MSD
Harmonic Balancer: Professional Products SFI Ignition Controls MSD Billet
Clutch Centerforce - DF920830 Firing Order 13726548

Tony R.