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Re: Pick a cam for the Imperial [Re: feets] #2031865
03/15/16 07:36 PM
03/15/16 07:36 PM
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The Ed heads and springs can handle quite a bit of cam but agree with many intake duration needs to be in the 210-215 range @.050. A really fast ramp would get more lift and performance... and also may make noise like a solid. Is that OK? Personally I like the sound (and run solid) but not sure it is in character for a C body.

Re: Pick a cam for the Imperial [Re: feets] #2031932
03/15/16 09:22 PM
03/15/16 09:22 PM
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Central NC
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Advertised Duration (Int/Exh): 253/258
Duration @ .050 (Int/Exh): 208/213
Gross Valve Lift (Int/Exh): .454/.454
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: idle-5000

This Voodoo cam would work well enough and maybe they would grind it on a 110.

I think the mopar 272-.455 would very well advanced a little more than they recommend.It would make a very strong mid-range which is what you are asking for.

Or just call Dwayne Porter (or the cam grinder of your choice) and get the most bang for your buck.

HP manifolds beat logs and the Hedman shorty headers beat HP manifolds.

Re: Pick a cam for the Imperial [Re: feets] #2031992
03/15/16 10:40 PM
03/15/16 10:40 PM
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Downtown Roebuck Ont
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Whatever you do put a degree wheel on it this time. You have 3 aftermarket components that that can be off ie cam and 2 gears. A degree off here or there on any or all parts can stack up to be the difference between it runs hard and it just runs.

Kevin

Re: Pick a cam for the Imperial [Re: Twostick] #2032032
03/15/16 11:16 PM
03/15/16 11:16 PM
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Originally Posted By Twostick
Whatever you do put a degree wheel on it this time. You have 3 aftermarket components that that can be off ie cam and 2 gears. A degree off here or there on any or all parts can stack up to be the difference between it runs hard and it just runs.

Kevin



Agree completely!

Have you put a faster curve in the distributor? That's always done more to wake up soggy bottom ends than anything else on my Mopar vehicles. The 360 urged '75 Powerwagon was a slug down low until I recurved the distributor.

Re: Pick a cam for the Imperial [Re: dogdays] #2032042
03/15/16 11:25 PM
03/15/16 11:25 PM
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Oregon, U.S.A
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Wouldn't surprise me if Elgin is grinding Summits cams. They have the exact same profiles as the 6400 and 6401 in their catalog.

Re: Pick a cam for the Imperial [Re: feets] #2032797
03/16/16 11:15 PM
03/16/16 11:15 PM
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Brisvegas, Australia
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Under $400 gets you a set of either 1.6 or 1.7 PRW stainless rockers off ebay - that will fix your lift issue and let those heads breathe

the net lift with the stock rockers would have been around .430 - fine for factory steel heads, not for ally's

Re: Pick a cam for the Imperial [Re: Alchemi] #2033212
03/17/16 02:57 PM
03/17/16 02:57 PM
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Yes, the Voodoo cam mentioned above would work, however the Hughes has more lift with only two more degrees at 50, 0.480 against 0.454.

I looked at the Voodoo cams before I opened the Hughes catalog.
Hughes has been pushing the envelope for how fast you can accelerate a 0.904" lifter. They're on their third cam series and every one has higher lift per duration than the last one.

The Voodoo cam IS ground on a 110 LSA. It's just ground a little advanced. (112 + 108) / 2 = 110. The Hughes is ground, as most Hughes cams are, on a 112LSA. That's why I suggested getting it on a 110LSA and not just buying the shelf cam. Overlap is quite low with those small lobes, so a smaller LSA shouldn't affect the idle much if any.

R

Re: Pick a cam for the Imperial [Re: feets] #2033594
03/18/16 02:40 AM
03/18/16 02:40 AM
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Needs more compression, ditch the alum heads, go small chamber 1.60 exhaust valves. Still a band-aid.

Everything you have in that combo is wrong for what you want out of the car. Your alum heads are giving more away,

Re: Pick a cam for the Imperial [Re: NANKET] #2033747
03/18/16 12:15 PM
03/18/16 12:15 PM
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Irving, TX
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Originally Posted By NANKET
Needs more compression, ditch the alum heads, go small chamber 1.60 exhaust valves. Still a band-aid.

Everything you have in that combo is wrong for what you want out of the car. Your alum heads are giving more away,



More compression? Ya think?

I'm not going to rebuild the engine on this thing unless it needs it. If that's becomes necessary the car will likely become yard art for a while. That also means that if I have to drop a bunch of money on the car it's going to be ignored for some time.

The Eddy heads are on there because I had them and there was a problem with a factory head.

I'm up to my ears in small projects and have a far more important car project I need to get to.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: Pick a cam for the Imperial [Re: NANKET] #2033776
03/18/16 01:16 PM
03/18/16 01:16 PM
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Not2farfromNashville, TN
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Originally Posted By NANKET
Needs more compression, ditch the alum heads, go small chamber 1.60 exhaust valves. Still a band-aid.

Everything you have in that combo is wrong for what you want out of the car. Your alum heads are giving more away,


This! Those alloy heads require more compression. I would get some iron heads and do minor tweaks. It would be a big plus. Build the Hotroddave super torquey mileage motor in the furture.


"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"
Re: Pick a cam for the Imperial [Re: Rug_Trucker] #2033797
03/18/16 01:32 PM
03/18/16 01:32 PM
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Irving, TX
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Originally Posted By Rug_Trucker
Build the Hotroddave super torquey mileage motor in the furture.



If I have to drop much money on this engine it will likely get replaced with something completely different.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: Pick a cam for the Imperial [Re: feets] #2033909
03/18/16 03:50 PM
03/18/16 03:50 PM
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Aluminum heads do not "require" more compression, they "allow" more compression.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Pick a cam for the Imperial [Re: feets] #2033910
03/18/16 03:51 PM
03/18/16 03:51 PM
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Downtown Roebuck Ont
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Alloy heads require more compression is a wive's tale that has been proven time after time on dynos around the world. There is a difference between "needs" more compression and "can tolerate" more compression.

An Edelbrock head flows more air than any stock Mopar open chamber head. Shear physics and chemistry dictate it will make more power with no other changes.

Choose the right cam, confirm the ICL and MAYBE a little more converter to get it out of the water easier. A so-called factory hi stall (2100-2200 RPM ?) would likely make a world of difference.

Kevin

Re: Pick a cam for the Imperial [Re: feets] #2033946
03/18/16 04:52 PM
03/18/16 04:52 PM
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Yeah I don't see any problem with a better flowing aluminum head, that's a non issue. It's not like they're B1's with giant ports, they're Edelbrocks that (if I remember correctly) had a mild cleanup. The Imperial will never be a rocket ship as is, low compression, tall gears, tight convertor, 5000lbs+, its operating as it should.

Re: Pick a cam for the Imperial [Re: WO23Coronet] #2034047
03/18/16 07:48 PM
03/18/16 07:48 PM
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Originally Posted By WO23Coronet
Yeah I don't see any problem with a better flowing aluminum head, that's a non issue. It's not like they're B1's with giant ports, they're Edelbrocks that (if I remember correctly) had a mild cleanup. The Imperial will never be a rocket ship as is, low compression, tall gears, tight convertor, 5000lbs+, its operating as it should.


That's why a well built 440 will walk off and leave a Street Hemi because of the big ports on the street model. These heads may have too big of ports for the RPM range.


"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"
Re: Pick a cam for the Imperial [Re: Rug_Trucker] #2034663
03/19/16 07:31 PM
03/19/16 07:31 PM
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Khemi, Stygia
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Originally Posted By Rug_Trucker

That's why a well built 440 will walk off and leave a Street Hemi because of the big ports on the street model. These heads may have too big of ports for the RPM range.


That's the same reason I'm not interested in the aftermarket aluminum heads for a 3.375 stroke 383.


68 Roadrunner. 383 4-spd. Beat up.
Re: Pick a cam for the Imperial [Re: NANKET] #2034830
03/20/16 12:50 AM
03/20/16 12:50 AM
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East Texas
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Somebody tell NANKET to empty his PM box or tell him to PM me please about parts he's looking for... Thanks...

Re: Pick a cam for the Imperial [Re: feets] #2034847
03/20/16 01:28 AM
03/20/16 01:28 AM
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Lakewood, Colorado
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We always had great luck running the Crower 267/271 cam in the B motors with Rhoads lifters. At 5000' we were gaining a bunch of torque even in the big heavy cars. That cam in a Blues Brother Monaco with a 440 and it would lay rubber easily. I might even consider going up to the 271/284 especially with the Rhoads VMax lifters. You get the longer duration and higher lift and good vacuum at idle. I can imagine at 700' it should be a much more spirited ride.


Matt
69 Dart Swinger 340
83 W350, Megasquirted with 46RH
Old news: 72 Demon street/race mobile
Latest: 70 Duster backhalf car
and even more
Re: Pick a cam for the Imperial [Re: Rug_Trucker] #2034855
03/20/16 01:47 AM
03/20/16 01:47 AM
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Canada
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Originally Posted By Rug_Trucker
Originally Posted By WO23Coronet
Yeah I don't see any problem with a better flowing aluminum head, that's a non issue. It's not like they're B1's with giant ports, they're Edelbrocks that (if I remember correctly) had a mild cleanup. The Imperial will never be a rocket ship as is, low compression, tall gears, tight convertor, 5000lbs+, its operating as it should.


That's why a well built 440 will walk off and leave a Street Hemi because of the big ports on the street model. These heads may have too big of ports for the RPM range.


Big difference between Hemi port size and a 906 vs an Edelbrock rpm and a 906, apples and oranges. I think you guys are chasing your tails blaming the aluminum heads

Re: Pick a cam for the Imperial [Re: feets] #2035825
03/21/16 03:34 PM
03/21/16 03:34 PM
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The 440 VS Hemi debate would not have any legitimacy if they had 440 cubes under the hemi heads. Try compareing a 426 wedge VS 426 hemi, even with the hp goodies from a 440 it ain's so close anymore. 14 cubes should be good for another 20lbs TQ. That ought to be enough to keep em even at launch then the hemi will simply walk away when the 906/915/452/306/516 heads choke. A little extra port velocity from more cubes sucking on the heads would help with air/fuel mix quality and help the plugs last a hair longer so tune-up frequency goes down.

As far as the imperial engine, those eddy heads are not causing any issue with power thats for sure.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



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