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383 with MP .474 cam - anyone running this combo?
#189483
01/10/09 03:57 PM
01/10/09 03:57 PM
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Joined: Jan 2003
Posts: 4,296
Chicago, IL
TonyS451
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Chicago, IL
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Might want to add a few go fast mods to the 383 in my 62 Newport. The cam I m looking at is MP 4452993 .474 lift, 238@.050 110lsa. Was also leaning toward a Performer RPM intake and 750 Holley, and maybe steel shim head gaskets for a little added compression. Planning to run a 3.73 or 3.91 rear and stock converter. I'm sure a little more converter would be better overall, but this is going to be on a budget just to have a little extra fun vs the stock 383 while I gather parts for something bigger. Anyone else running this cam and did you find it to work OK with the stock converter? Years back I ran a MP 284/484 with stock converter in it was a little weak getting up to speed. Thanks, Tony
2 kids and a dog
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189484
01/10/09 04:07 PM
01/10/09 04:07 PM
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Joined: Nov 2007
Posts: 21,819
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,819
Kirkland, Washington
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I ran that cam (474/280) in a low compression 73 440, 70 Cuda, 727 stock converter 3.55 gears.
Its a great cam, but old school. I was worried about the stock converter too, but it turned out fine. Lotsa low end grunt. The 484 cam is different animal, and a lot of people have tried it and gone to something else.
You can get more 'area under the curve' from a more modern grind, like a lunati voodoo, or a comp, but if is old school MP you want thats a good street cam.
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: Pacnorthcuda]
#189485
01/10/09 04:34 PM
01/10/09 04:34 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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I think its a real good cam for a mild 440. If youve got decent compression it should work well if youre going to use 3.91s. Stock stall is a little low for a 383.
RPM intake and 750 Holley sound good for it, I think it will run pretty darn good. What heads are on it?
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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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189487
01/10/09 05:20 PM
01/10/09 05:20 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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master
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Is the 383 rebuilt, original, or what? If its original is it a '68-'71?
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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Re: 383 with MP .474 cam - anyone running this combo?
[Re: GTX MATT]
#189488
01/10/09 05:31 PM
01/10/09 05:31 PM
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Joined: Jan 2003
Posts: 4,296
Chicago, IL
TonyS451
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Chicago, IL
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Quote:
Is the 383 rebuilt, original, or what? If its original is it a '68-'71?
Good question. I was told it was a "late 60's" 383 and the heads were changed to 452's to use todays fuels. To be honest, I have not so much as pulled the aircleaner off, let alone a valve cover, so I can't really confirm anything. I can however confirm that it runs good, doesn't smoke or tick and holds good oil pressure. I was told the heads were recently rebuilt. I have no clue what compression ratio, but my guess fwiw is 9-1, maybe less.
2 kids and a dog
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189490
01/10/09 06:24 PM
01/10/09 06:24 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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Quote:
Quote:
Is the 383 rebuilt, original, or what? If its original is it a '68-'71?
Good question. I was told it was a "late 60's" 383 and the heads were changed to 452's to use todays fuels. To be honest, I have not so much as pulled the aircleaner off, let alone a valve cover, so I can't really confirm anything. I can however confirm that it runs good, doesn't smoke or tick and holds good oil pressure. I was told the heads were recently rebuilt. I have no clue what compression ratio, but my guess fwiw is 9-1, maybe less.
Id check the numbers. If its an early (pre-68) engine Id look at another cam, your compression will be absolutely terrible. Maybe even in the 7s. If its a '68 and later engine 9:1 is a decent guess.
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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Re: 383 with MP .474 cam - anyone running this combo?
[Re: GTX MATT]
#189492
01/10/09 06:57 PM
01/10/09 06:57 PM
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Joined: Jul 2004
Posts: 1,101
Retired now in Tennessee
Chi_Town_Runner
super stock
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super stock
Joined: Jul 2004
Posts: 1,101
Retired now in Tennessee
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Quote:
Id check the numbers. If its an early (pre-68) engine Id look at another cam, your compression will be absolutely terrible. Maybe even in the 7s.
I Agree. I had a '67 383 with 906 heads (I know, open chamber, another problem). I put that cam in and the car was a dog. It idled nice but had no power, even with a 4-speed and 3:91 gears. Pistons on pre '68 383s are way down in the hole.
Easy chack, look at the pad just in front of the passenger side head. If it's A, B, or C, don't bother. Just my 
Good Luck, 
Frank 
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: Chi_Town_Runner]
#189493
01/10/09 07:17 PM
01/10/09 07:17 PM
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Joined: Jan 2004
Posts: 3,001
Coram, NY
Pool Fixer
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Coram, NY
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I'm running one in my 440,68 charger. I ran a 13.094 with it at the track with 3.55's, 2800 converter, way too tall hoosier street slicks (had tread) 10:1, 1 3/4 headers, performer rpm, eps750 edelbrock carb, MP electronic ign. kit with orange box.
I pretty much set the initial timing and never touched the carb, dist curve. If I even came close to knowing how to do any of that, I might have gotten her into the twelves that day.
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: 383man]
#189496
01/10/09 11:12 PM
01/10/09 11:12 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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run that cam in 68 383 coronet. best of 13.5@105 with stock converter.
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189497
01/11/09 01:12 AM
01/11/09 01:12 AM
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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 have ran the old street hemi grind cam in the 383 with GREAT results.The old specs are 284° 471I/474E.It's a very good cam to use.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189498
01/11/09 01:45 AM
01/11/09 01:45 AM
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Joined: Jan 2005
Posts: 2,179
S.E. Conn
Hoof Hearted
top fuel
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top fuel
Joined: Jan 2005
Posts: 2,179
S.E. Conn
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I had it in my 70 RR, 383, 4 spd, 3:55, Performer RPM, Really lacking in the low end...
Keep searching; Go anything Voo Doo / lunati...
also hadrefurbished heads w/ big valves from aero heads. Bigger valves couldv'e been problem.
2005 300C Hemi
2014 Ram ProMaster 2500
I Rekey, Repin old Chrysler locks and cut keys by code
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189499
01/11/09 10:02 AM
01/11/09 10:02 AM
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Joined: Feb 2005
Posts: 4,311
Prospect, PA
BSB67
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Prospect, PA
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I still have that cam in my 383 GTS, and really like it in my application. It ran low 13s at about 107 w/ full exhaust and G70 14s and a slipping clutch.
However, I have a 3.91, good CR and cylinder pressure, Rhodes lifters, 4 speed, 1 5/8" under chassie headers, and of course it is lighter than yours. I think that my application is different enough from yours and that puts me on the fence for recommending this cam in your application. With your weight, gear, converter, and cyl. pressure (I'm guessing that it is low), I would probably go a little smaller.
If you are leaning toward a MP cam, I would consider the 272* cam. This cam is usally overlooked, probably because it is so close to stock based on the numbers. I've run this cam in my Charger before I put in the new motor, and it ran 12.90s regularly at about 108 (exhaust manifolds, 3.23, and stock converter)
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: BSB67]
#189500
01/11/09 12:03 PM
01/11/09 12:03 PM
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Joined: Jan 2003
Posts: 4,296
Chicago, IL
TonyS451
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Thanks for the input and posting your combos. The engine is a '67 383. Not sure of the compression, but I can only imagine with the open chambered heads its not good. I also have no idea if/when the engine has been rebuilt, so I can only assume they are stock slugs. It "looks" like it has been worked on, or at least painted on not too long ago.
I can always mill the heads for some compression, but thats about as much as I care to invest into this engine. On a side note, what happened to the MP steel shim head gaskets? Can't seem to find them anywhere, but then I found Summit has them listed for almost $200 dollars. Didn't they used to cost like $20 bucks?
2 kids and a dog
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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189501
01/11/09 12:10 PM
01/11/09 12:10 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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Oh boy, I hate to say it but youre going to have to change those heads if you want any power. You can probably get someone with a set of usable 516 closed chambers to trade you or sell yours to buy a pair. You will loose some flow but youre really going to need that compression, its going to be terrible.
Either that or have yours milled to about 80 CC, which is doable, youre just going to have to have the intake side machined as well.
I also like the 272 cam mentioned before, when I had my GTX it had a purpleshaft in it and Im not 100% sure which one but I beleive it was the 272 because it idled pretty tame. TONS of low end torque, half throttle and the tires were TOAST.
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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Re: 383 with MP .474 cam - anyone running this combo?
[Re: TonyS451]
#189502
01/11/09 06:16 PM
01/11/09 06:16 PM
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Joined: Jan 2003
Posts: 17,841
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,841
S.E. Michigan
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MP's supplier said they didn't want to make those steel shim gaskets anymore. It went out for requote and took off like a lead balloon....none of MP's supply base is interested in making them. Volume must be too low or something? MP then superseded them to a thin Cometic, and that's why the price went way up. That said, Mancini is looking into having the steel shims made again independantly of Mopar but I'm not sure where they are at in that process. If you're absolutely, definitely going to run a 3.91 gear the .474 won't disappoint you. Any less gear than that, and I'd use the 272/455 cam instead.
Rich H.
Esse Quam Videri
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