need intake and carb input

[darkside]

I am looking to buy a new intake and carb set up for my 383 in my 69 charger.I dont want a high rise intake cause i want to keep my stock throttle linkage set up and i dont want hood clearance to be an issue. .I am thinking about the edelbrock performer intake with a speed demon carb  650 or 750 cfm.Anyone running this intake? anyone running a demon carb?

[Ghoste]

Get the Mopar M1 dual plane before the Edelbrock piece.  The Performer RPM is a good unit but then you run into the height issue.  The basic Performer is more or less an aluminum copy of your stock cast iron one.

[darkside]

The m-1 is a high rise and its a higher rpm intake ant it?I want a intake that makes good low rpm power and will have no hood clearance issues

[Ghoste]

There's an M1 dual plane and a single plane.  The dual plane is pretty close to the stock one I beleive.

[mopar_madman]

holley street dominator, I hear good things but you would have to buy used they are discontinued .

[Chryco Psycho]

the M1 is a better intake than the Performer
I would use a 750 Holley or Demon & personally I like the Double Pumpers better

[firefighter3931]

If the motor is stock....the factory 70-71 4bbl manifold is hard to beat. A performer rpm dual plane is the next step up, but then you're into linkage modifications and hood clearance issues with the factory air cleaner assembly. The old edelbrock dp4b is a very good street manifold but you'd have to find one used as they're no longer in production. I prefer the double pumper carbs as well. 

Ron

[694spdRT]

If the motor is stock....the factory 70-71 4bbl manifold is hard to beat. A performer rpm dual plane is the next step up, but then you're into linkage modifications and hood clearance issues with the factory air cleaner assembly. The old edelbrock dp4b is a very good street manifold but you'd have to find one used as they're no longer in production. I prefer the double pumper carbs as well. 

Ron

Ron,

Would an intake off a '71 C body 440 be the same as the HP?

Thanks

[Ghoste]

There are some differences differences between various years but in each case, the same intake was used for a 440 New Yorker in 71 as a 440 Road Runner in 71.

[firefighter3931]

If the motor is stock....the factory 70-71 4bbl manifold is hard to beat. A performer rpm dual plane is the next step up, but then you're into linkage modifications and hood clearance issues with the factory air cleaner assembly. The old edelbrock dp4b is a very good street manifold but you'd have to find one used as they're no longer in production. I prefer the double pumper carbs as well. 

Ron

Ron,

Would an intake off a '71 C body 440 be the same as the HP?

Thanks

The list i have show's a few different manifold castings for the 71 440 engines. I'm not positive what the difference is exactly....maybe there's no difference at all.....just different casting dates ? The general consensus is though, that the 440 hp manifold (70-71) is the best factory 4bbl intake ever made for an RB engine.

Casting # 2951736 is the 70-71 manifold i am referring to.


Ron

[694spdRT]

Thanks Ron

I will check the one I have at home for a number.

[Ghoste]

I must have an incomplete list.  I get a manifold for 68 and 69, another for 70, and then one again for 71.

[darkside]

Anyone running the mopar m-1 style low rise intake?Whats the rpm range on the  intake ,part # p4529117?

[Brightyellow69rtse]

Ron buddy dont tell me you got off the street dominator band wagon?? keep an eye on ebay i cot mine for like 105$ and it needed a bit of welding and machining. i bought a brandy new on for my 440 a year or so ago i cant guarantee its still in production. i doint understand why they would make the rb one again and not the b one...........streetdom wwwooooohhhhhhhhh .........Mike

[Ghoste]

Ron's the one who convinced me to go with the Street-Dom and I have never regretted it.

[firefighter3931]

Ron buddy dont tell me you got off the street dominator band wagon??

Not at all Mike....the SD is a great manifold. Remember you and Shawn both have 4.10 gears and hotter than stock camshafts. 

Stock engine/mild gearing means a dual plane is the "better" option. Not that the SD wouldn't work OK on a mild combo....it's just not the best choice for the application, inmo. 

Ron

[694spdRT]

The list i have show's a few different manifold castings for the 71 440 engines. I'm not positive what the difference is exactly....maybe there's no difference at all.....just different casting dates ? The general consensus is though, that the 440 hp manifold (70-71) is the best factory 4bbl intake ever made for an RB engine.

Casting # 2951736 is the 70-71 manifold i am referring to.


Ron

The casting number on my manifold is 3512501 with casting date of 10-26-70. It came out of a '71 Imperial.

[firefighter3931]

That manifold (3512501) lists as a '71 only casting. The 2951736 is a '70-71 casting. There is a 3rd number ; 3614014 which is a '71-72 application. I'd bet these are all the same....or pretty close in design. Do you have a pic(s) of it 69rt ?

Ron

[694spdRT]

I will go take one quick...be back in 5 minutes. 

[694spdRT]

Sorry..a friend called and I am on dial up. 

Here are a couple pics.

[firefighter3931]

Yep...that's the good one.  Notice the size of the front runner....nice and wide compared to the earlier 67-68 castings i've seen. I'd have no problem running that manifold....well maybe i'd clean it first 

With 3.23-3.55 gears on an engine that was slightly warmed over....no problemo !   

Ron


Ps here's a pic of the performer....it looks very close to the 67 casting i have here....small runners.

[694spdRT]

Thanks Ron

So in theory that manifold would be an improvement over the 4 hole '69 casting I have on my 440 now. The '69 manifold has been ported some so perhaps the improvement would be small.   

I have to remove the manifold anyway this winter so it might make for a good swap.

My 440 is balanced, 9.5 to 1, Engle K56/k58, ported 906's with oversized valves, ported iron HP manifolds, 800 Eddy AVS, and 4 speed with 3.54's.

[firefighter3931]

If there's any improvement it would be in the top end power. It's hard to say because the extent of the porting is hard to measure w/o a flowbench. That 70-71 manifold was part of the 11 manifold shootout that MM did several years back. On the test engine it still made 575hp so it does move a lot of air for a factory intake manifold.

With a combo like your's, i'd be inclined to try it out....it certainly won't perform any worse than what's on there now, inmo.

Ron

[694spdRT]

Does the lack of a 4 hole vs the 2 hole have any effect or is it mainly the runner size that makes the manifold better?

I can't find a good pic of a '69 casting to compare the runners but, if it is similar to the one you posted it couldn't hurt.

[firefighter3931]

It's the runner volume that either restricts or enhances flow....depending on the size of course. Small runners with a dual plane will make excellent torque and a strong signal to the booster producing sharp throttle response. But if the runners are too small...the top end power suffers. You have to remember that a factory hp 440 was rated at 375hp at only 4700 rpm redline....these engines were designed as torque monsters and were cammed accordingly. Port the heads and run more cam and the flow requirement increases...

It's all about balance between tq and hp....dual planes by design produce excellent torque. That's why the RPM is such a good manifold...great bottom end power and enough runner/plenum volume to pull to 6000+ rpm. The RPM has shown on the dyno and the track to be a solid performer....a very good balance between torque and hp.


Ron