Replaced My Indy Single Plane....

Is your intake for an RB or low deck?

An 1000HP is probably the same as a 850. Carb guys call the 850 with a smooth air horn (no choke housing) a 1000, even though it doesn't actually flow 1000cfm.

I have been using a Indy single plane on my 493 for 9 years.
I drive it about 3000 miles per year with a 1100 cfm Pro Systems dom carb, and it runs great.
What problems are you having?

I use the Indy dual plane on my 493. The eng has only been in the car since last summer and the dual plane is the only intake I have tried. But I love it as the car has very nice low end grunt. Its a street/strip car and has run 10.70's so far on pump thru the pipes but I plan to work on some tuning this year and maybe get my hands on a bigger carb to try. I also run a standard Holley 850 DP and was thinking I need more carb as I had to jet it up alot from the old 440 combo I use to run and I mean alot as it wants alot of fuel. But it went faster with more fuel and I am not done yet. I would love to try a Dominator on my 63 with the dual plane and the single plane to see which it likes better.

As for my throttle cable I use the Lokar setup and it works great. And it is so simple to set up. You dont need any throttle bracket other then what they give you. It bolts on the back carb stud and the return spring also hooks to it. Works good for me and is very simple. Ron

I used Andy's other throttle bracket so I could retain the factory kick-down linkage. Like someone said, it needed a little tweaking too clear the runner. I believe that it was intended and designed for the RPM intake. I narrowed and chamfered the rear mounting leg as shown.

I've run both the 4781 and 950 HP on mine. My 950 has the 1 3/8" venturi. The 950 is better on the street and faster at the track. This car/engine spends 90% of its time at or below 2200 rpm.

I drove around without the hood, for a while and it still had a bookoo
of torque. I just couldn't shut the hood. Haven't driven it yet with the Indy Dual Plane, just fired it up. This is an 80% street car. My Combo: 1969 Charger
'77 440 Block
4.25 Stroke
6.86 Rods w/2.2 journals
Reverse Dome Forged Pistons
Indy EZ Heads, Max Wedge Ports, Milled and Ported by Compuflow, flow 350 CFM on his bench
Comp Solid Roller
250 and 259 @ .050 .649 and .655 lift
Harland Sharp Rockers
Max Wedge Size Indy 2D
1000 AED DP carb Prepped by AED for my motor
CRT 727 w/manual valve body
Dr. Diff Dana 60 w/3.73's

All of that work and measuring and it still wouldn't fit under the hood? Sorry to hear that, but it will still be more than reasonable for your "street" car.

There's probably 20+ HP in working the Lower plenum to "tweak" the 2 weaker runners on the 2D, the upper plenum runners already flow ~355-360 in MW form. With the radius work the ports will all flow about the same, look up the Roger Helgessen (Dr Air) article. Once you do those tweaks you have a dual plane capable of up to an over 700HP that gives unequalled throttle response and (most importantly) roll-on part-throttle torque that makes a 500" motor ALWAYS feel like 500", from wall to wall off idle to redline. ot knocking the Indy single, it's a great HP maker at WOT, but being a street driven car spends ~90% of it's time below 4K and at part throttle and below 75 mph, the 2D is just an overall more efficient torque builder, especially for a 3500+ pound mostly street car...you'll see I've run the single on a couple 493's, it's more of a 'light switch' , the torque is either 'off' ( yeah, it's good, but by comparison, maybe not as good as it could/should be) or 'on' ( but 'really' on).

For the street : I always visualize running the Motor on a road race type powerband, not a drag strip. The 'overall enjoyment regardless of road conditions means more to me than a few extra Hp 'bragging numbers' up top....maybe I'm just getting old. But I'll give up a couple tenths in ET if it would give me back seconds off a lap time....opinions vary I guess.

Nice looking engine. Yep, that KD throttle bracket was never intended for the Indy intake, but I can tweak the design next time I run a batch of them so they have a little more clearance in that area.

The Indy casting is super thick around the bolt holes. A Victor intake has about a 1/4 inch gap between the runner and the throttle bracket, but the same bracket rubs on the Indy intake.

Wize. Who has or does the port work on those lower runners on the 2D?

I've been running the Victor 440 4150 intake on my BB which is under 500 ci and with a stock port window for some time now and feel its a good torque maker but then again my car is under 3500 lbs as well.

I followed Roger's narrative that was published in the 5 page article but took mine a bit further in that I also enlarged both main plenums to help slow the peak airspeed at High RPM and make it hang on a bit harder up top. The #7 plenum transition needed the most work if I remember right.

Andy

Where did you say I can find your brackets? I have your book as well,
helped guide me through my build process. It was a super good read.

www.hughesengines.com

http://www.hughesengines.com/Index/produ...mcgUHJvZHVjdHM=

Thanks Andy!!

https://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=5336582&an=0&page=0