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Topics - 427LX

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1
A friend brought it by to see if I could find info on it. Numbers stamped on rear journal are HIT-290-NC  and 34 26 91.  Has been run a short time but lobes and all look in very good condition.
He wants to run it in a 390 he is building and I told him if so buy the BEST lifters you can find thru Bullet cams or Howards and make sure they spin freely in the bores. He does not have the original lifters.  Thanks for any help. Now I could set it up in my lathe with my cam check setup but thought I would check here first and determine whether it is a hyd. or solid grind.

2
Okay when running the Tunnel Wedge intake manifold and a pair of vac. secondary Holley carbs is that balance connection really needed?  Now on the Chrysler
 426 Hemi with cross ram intake they ran fine without it with their 770 cfm vac. secondary carbs. The cross ram was like a pair of 4 cylinder engines running and same might be said with the
Tunnel Wedge looking like a pair of separate four runner intake manifolds. So how did both run well with and without.

3
I have to come here to try and get good info on the characteristics of the tunnel wedge intake design. I have my custom made intake of same design but made to fit
the 9.5 deck Windsor engines of 351 thru 440 cube stroker versions...mine being 427.

Now what I have going on is the intake is very cold natured on startup even on an 85 degree day.  With the idle and cruise A/F at 13.4 to 14 at normal 180 F temp it runs fine with great response running off front carb in a progressive linkage setup on a pair of Holley 770 CFM carbs with vac. secondary.

On first startup I have to keep RPM in the 1800- 2000 range to keep it running at a 14.9 range...higher RPM the richer it is. Anything below 1500 and it sputters at 16 A/F ratio. As it comes up to temp it will settle down at it's 1000 rpm idle at a 13.4 A/F. Drive  it and then after a 20 minute shutdown with engine still warm  you still have to keep the RPM up to 1500 for a decent fast idle and then it will settle down to it's normal running. No chokes on the carbs. I tried a manual Holley made  choke and it did do the job but the pivoting cable lock and flex from even a solid cable did not let the choke blade fully open...too much slop.

Now on a cold startup I plug in my engine coolant heater which I used on my other intake during chilly temps to heat the intake and that helps. Other than this it pulls like crazy above 4000 RPM!
Note....carb jetting is now 76 Primary and 84 in Secondary both carbs.  Stock .075 IAB and stock R-3310 idle fuel jet. Idle screws  1 turn out all around.

Do you guys that run the FE 427 Tunnel Wedge intake on the street have same issues or is mine a strange case? Thanks for any help!

4
One of the guys did a dyno compare on his hot street 418W. Victor Jr. with 830 Holley vs. the Tunnel Wedge with a pair of Holley 465 carbs.  The Tunnel Wedge was bolted on
right out the box with no port matching or other work. 1 inch 4 hole spacers on the intake and heads were AFR 205 I believe.  Took some jetting changes to try and get the cylinder A/F as close as possible as O2 sensors for each header pipe. The Tunnel Wedge was ahead by 30 HP and 11 Torque at 6400 RPM !

5
 Anyone running the 4160 style carbs on the 2X4 intake convert the secondary bowl to a standard fuel inlet for a true dual feed.   I had a transfer tube O ring just suddenly give up causing a nice leak. Luckily this happened in my garage and not on the road!  Had done a jet change on Saturday and everything ran fine all day. Next morning try to go for a drive and O ring failed on startup.
First time that has happened in 10 years running my carbs and now I just don't trust the O rings!!  I have modified an extra bowl I have and it is simple enough to do. Set it up in my mill and machine off the spun over material. Take a center drill and when it gets a bite the steel plug with O ring spins right out. The inlet bore diameter is same as the primary bowl so I tapped it for 9/16-24 thread like the other for screw in Holley type hose barb. Now sealing up that transfer port you have some options. I am trying the tap it with 1/8-27 pipe/plug tap and will use brass Allen socket plug with generous amount of Permatex Aviation sealant.   
Any of you race guys do this mod? Will test one carb out and see if the plugs stay leak free.

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FE Technical Forum / Question for the Tunnel Wedge intake experts?
« on: August 01, 2025, 11:38:49 AM »
Would it help flow into runner if this radius area is larger than  the 1/4 inch radius as cast?  Will be running a 1 inch 4 hole merge type spacer also.

7
First of it's kind out the mold....Tunnel Wedge intake for the big Windsors!   I have been pleading with the BIG manifold companies for 15 years to make them but only the sound of crickets.
Finally found a company to get the job done! Will be going on my 427W to replace the current Price 2x4 intake which is still a great manifold. Only 5 to be made right now by JAK Performance.

Bottom pic my current Price 2x4 intake

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In the typical 1965 Cobra setup shown here.  Amazing they ran as good as they did! Supposed to be an exact recreation of first Shelby 427 Cobra.

9
The ones for the 351 Windsors punched out to 427 cubes.  Waited a week to get them from Ansen who makes the for Ford.  Go to put them on and
find they hit my roller rockers before the bolt holes come anywhere close to lining up. When you see how they angle the sides in and out for the "look" compared
to my old ones that is why they hit. Damn shame as they really look great!  You would think being a race type tall valve cover they would make them wide enough
to clear roller rocker arms!!

10
When the 428 CJ came about in mid 68 Ford just grabbed the old 390 4bbl GT cam and called it done. Maybe an okay choice for the general use with mild gears auto trans and A/C options.
However did they miss the boat a bit with the SCJ package ?  If I remember they had a better camshaft specd out for the 50-100 cars that were built for NHRA class racing.

11
Non-FE Discussion Forum / Battery charger issue.....
« on: February 04, 2022, 03:04:27 PM »
Have my old Sears Heavy Duty charger/booster and it has worked well for over 25 years. However now when you hook it to a battery for a charge the voltage jumps
to 15-16 volts measured at the battery while charging. Of course I shut it down so as not to overcharge the battery. Battery was at 12.5 before any charge.
Output at the charger leads with no battery hooked up is 13.7 when in the slow charge selection. Charger never used to act this way.

12
FE Technical Forum / Need a Holley carb parts expert....
« on: September 14, 2021, 08:59:16 AM »
Can someone tell me why the Holley 4224 660 carb takes a Holley 6-508 needle and seat vs. the 6-506 which is listed for the 1850 600 carb? This info straight from Holley carb and parts catalog.
Both are exetrnal adjustment and both have same .097 sized hole.  Call the AED shop down the road and they didn't know of any difference but they make there own needle and seats and use
their same external adjustment needle and seat for all Holley carbs with various feed hole sizes being different.

13
FE Technical Forum / Need an intake adaptor for this one !
« on: September 04, 2021, 12:53:34 PM »
Wow :o      https://youtu.be/DZPEDZEFAuc!   

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I found some interesting test facts and some that might surprise!     http://carbdford.com/fletch/tech/intakes/intakes.htm

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FE Technical Forum / Intake manifold plenum design differences.......
« on: August 19, 2021, 06:43:27 PM »
Does one style plenum design have any advantage over the other?  Comparing the Edelbrock  split log style to Ford's 4 hole crossways plenum. Other OEMs used the log style too.

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