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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596402
01/28/10 03:10 PM
01/28/10 03:10 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Anyone have opinions on the .474 version?
What exactly is the right combo for the .484? Most guys I've seen are running 3.91 gears. Will it work with 346 heads?
My only concern is the torque side. 71' Roadrunners weigh roughly 3800-4000lb so that's another factor.
the 474 would be better for your application. As for what do you need to make the 484 work...compression, decent heads, headers, stall (you have pedals so no big deal there) and at least 3.91's especially in a heavy car.
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Re: MP .474 or .484 in a 383?
[Re: Paul_Fancsali]
#596404
01/28/10 04:29 PM
01/28/10 04:29 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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I do want the power but I plan on taking a cross country trip when the car is done from san antonio, tx to central maine.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596405
01/28/10 04:45 PM
01/28/10 04:45 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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.050 duration on a 484 is ~241, the 474 is around 232, IIRC.
for a heavy car and highway gears, I'd keep .050 duration ~224@.050 max, otherwise you'll be disappointed with idle-3500 RPM performance.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: MP .474 or .484 in a 383?
[Re: patrick]
#596407
01/28/10 04:48 PM
01/28/10 04:48 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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Camquest shows the 268AH-10 to give me the best results but that's just on the engine and not the rest of the drivetrain.
Here are the specs:
Advertised Duration 268 int./276 exh.
Advertised Exhaust Duration 276
Advertised Intake Duration 268
Basic Operating RPM Range 1,600-5,600
Cam Style Hydraulic flat tappet
Camshaft Gear Attachment 1-bolt
Computer-Controlled Compatible No
Duration at 050 inch Lift 222 int./226 exh.
Exhaust Duration at 050 inch Lift 226
Exhaust Valve Lash 0.000 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.464 in.
Grind Number 268AH-10
Intake Duration at 050 inch Lift 222
Intake Valve Lash 0.000 in.
Intake Valve Lift with Factory Rocker Arm Ratio 0.464 in.
Lobe Separation (degrees) 110
Notes Single-bolt camshaft, fits factory ID 2899206.
Quantity Sold individually.
Valve Lift with Factory Rocker Arm Ratio 0.464 int./0.464 exh.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596408
01/28/10 04:53 PM
01/28/10 04:53 PM
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Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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We ran the old version of the 474 in our 383 Road Runner for many years.In fact it still has that same cam.It's a great cam,we ran 12.20's with it and it streetable and delivers good power.I'd use it over the 484 on the street with you car.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596409
01/28/10 06:37 PM
01/28/10 06:37 PM
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Joined: Jan 2003
Posts: 17,842
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,842
S.E. Michigan
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Quote:
Camquest shows the 268AH-10 to give me the best results but that's just on the engine and not the rest of the drivetrain.
Here are the specs:
Advertised Duration 268 int./276 exh.
Advertised Exhaust Duration 276
Advertised Intake Duration 268
Basic Operating RPM Range 1,600-5,600
Cam Style Hydraulic flat tappet
Camshaft Gear Attachment 1-bolt
Computer-Controlled Compatible No
Duration at 050 inch Lift 222 int./226 exh.
Exhaust Duration at 050 inch Lift 226
Exhaust Valve Lash 0.000 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.464 in.
Grind Number 268AH-10
Intake Duration at 050 inch Lift 222
Intake Valve Lash 0.000 in.
Intake Valve Lift with Factory Rocker Arm Ratio 0.464 in.
Lobe Separation (degrees) 110
Notes Single-bolt camshaft, fits factory ID 2899206.
Quantity Sold individually.
Valve Lift with Factory Rocker Arm Ratio 0.464 int./0.464 exh.
Near identical specs to the MP 272/.455 which I feel is the best overall choice. .474 is an ok second choice but I wouldn't go any bigger than that 
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596412
01/28/10 08:42 PM
01/28/10 08:42 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I have used both the .484 and the .474 cams in street cars. Both screamed in the cars but they had the right setup. I had the .474 in a stock 340 Dart with headers and a 650 DP. It had 4.10's and it would smoke the tires from a 15 mph roll. Took it to the track and ran 13.49 @ 105 on real street tires. I had the .484 in my old 383 Dart that was a stock 383 with bolt on's and some mild pocket porting on the 452 heads I used. Click the link for the details. It ran 12.30's @ 110 best with 3.91's after I switched the Torker intake for an RPM. I do agree for your car the .474 would work better then the .484. But if you plan to keep the 3.23's I would call a cam company and have them grind you a cam for your application. Ron http://www.bigblockdart.com/ron_nies/ron_nies.htm
Last edited by 383man; 01/28/10 08:45 PM.
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Re: MP .474 or .484 in a 383?
[Re: BSB67]
#596414
01/28/10 08:57 PM
01/28/10 08:57 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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I'm not dead set on keeping the 3.23's. So I'll probably just find another third member so I don't have to use my #'s one. I know my old man has more than one sitting around the house and one is a 3.91 gearing. I'll probably go with the .474 to work with my AC and with a 4 speed it should do pretty good in the 1/4.
I sent comp cams a request to get there 2 cents. I'll probably just stick with MP.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596416
01/29/10 12:42 AM
01/29/10 12:42 AM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Quote:
I have a buddy of mine who was offering me this purple cam for my 383. He ran it for a while in his 440 before he swapped cams and went with the larger .509 mp cam.
My car is a stock 4 speed, manual brakes, and power steering so vacuum is not an issue here. Weighs roughly 3800-4000lb and is going to be mainly a street car. The car does have the stock AC in case anyone is wondering and 3.23 gears but can bump to a 3.55 if necessary. Most of the 383 will be stock, minus the headers, performer intake, and carb. I'm going to do some head work on my stock 346's. I was looking at the XE262 comp cam but If I get a freebie cam that'll save me some money.
Which 484 Mopar cam, as there are 2 of them..
The original one (P4120235) and the later one (P5007697).
The original 484 has a great idle lope and runs well in a 4 Speed car up to 6K, but has low vacuum.. (<8")
If street driving and car has power brakes and auto trans, the later 484 is a better choice for street driveability.
Just my $0.01.. 
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Re: MP .474 or .484 in a 383?
[Re: Sinitro]
#596417
01/29/10 12:54 AM
01/29/10 12:54 AM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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It is one of the original 484 with the 108 centerline. As I mentioned I have manual brakes and 4 speed so vacuum and torque converter are no concern.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596418
01/29/10 01:49 AM
01/29/10 01:49 AM
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Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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Quote:
I do want the power but I plan on taking a cross country trip when the car is done from san antonio, tx to central maine.
I have a 9.3:1 440 that has had a .474 280 MP cam in it for at least 12 years. I have run the MP .590, .557, .528, .509, .484, and comp cam .501.
The motor sounds sweet, and has a very good torque curve. A factory type 2400 rpm converter, and 3.23 to 4.10 is all you need. I know you have a stick. There is a couple of tenths difference between the gears I listed, and the 4.10 is actually too much unless you have eddy heads, the rpm intake and tti headers. The motor pulls hard all the way to over 6000 rpm.
If you just have manifolds, full exhaust, stock or performer intake, stock heads, the motor is just about done at 5200 rpm. You could rev it higher, but there is no gain at the track.
The difference between the two combinations is anywhere from 1.5 to 2 full seconds of difference in my experience. I've gone a best of 111.9 mph in the quarter at 3900 plus lbs.
I've been tempted to put the .528 cam in, but the .474 just works so well as a driver, needing just a minimum amount of pedal to be a fun car. With a 3.23 gear, cruising at 70 mph is OK and 108-109 mph in the quarter still happens.
The fuel economy is approaching 20 mpg if I can cruise around 50-55 mph and keep my foot in check. I'm tempted to try my 2.72 gear for cross country driving.
I had a chance to do a few runs on a chassis dyno and had 389 hp on the best run at the rear wheels. I think that I could find more with another cam, but it may not be as much fun. Sometimes, less is more.
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: MP .474 or .484 in a 383?
[Re: 71383beep]
#596420
01/29/10 02:36 AM
01/29/10 02:36 AM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
OP
mopar
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OP
mopar
Joined: Feb 2009
Posts: 583
San Antonio, TX
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Looking at your spec card, it looks like comp decided to use almost all the same specs but shorten the intake duration and lengthen the exhaust duration. Not a bad idea utilizing the larger exhaust valves on stock heads, or any other head for that matter.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: MP .474 or .484 in a 383?
[Re: CurYellowBird]
#596421
01/29/10 03:23 AM
01/29/10 03:23 AM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,161
CT
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Quote:
Looking at your spec card, it looks like comp decided to use almost all the same specs but shorten the intake duration and lengthen the exhaust duration. Not a bad idea utilizing the larger exhaust valves on stock heads, or any other head for that matter.
The Mopar published numbers aren't very accurate anyway. They just multiply the advertised duration by .85. Apparently the Mopar 509 is over 250 @ .050. Anyway, I have a friend with the Nostalgia 509 in a Dart. Its just as fast as the Mopar cam (he had one in there before but the cam went south), but idles better.
Anyway, I understand that you're trying to not spend on the cam here. If you're being offered the two I would take the 474, it has a 110 LSA which will work better with your manifolds, and obviously less duration. But you will have to change the springs too. Are you getting those for free? Because the Mopar ones aren't cheap. If you have to buy a timing chain, and replace your valve locks and retainers, and obviously you need valve stem seals, Comp sells kits with all of the above for $420. So you might get the cam for free, but not save much after you buy the other stuff. Just food for thought.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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