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Re: 1970 383 cam suggestions?
[Re: 70SportSatellite]
#210254
02/01/09 09:50 AM
02/01/09 09:50 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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The one that came in the stock 69-70 383 Roadrunners. Great old cams. Sound good and run pretty good
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Re: 1970 383 cam suggestions?
[Re: High Impact]
#210257
02/01/09 10:50 AM
02/01/09 10:50 AM
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Joined: Aug 2003
Posts: 4,384
Madison Wi
NTOLERANCE
master
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master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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I had the MP street hemi cam in the 383 in my Dodge W200. nice lope at idle, good all around cam, good power, and cheap as well.
I used to care but....... things have changed
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Re: 1970 383 cam suggestions?
[Re: gch]
#210261
02/01/09 02:19 PM
02/01/09 02:19 PM
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Joined: Jan 2003
Posts: 1,066
California
70SportSatellite
OP
super street
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OP
super street
Joined: Jan 2003
Posts: 1,066
California
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Quote:
Check out one of Hughes engines whiplash cams
Thanks, I currently have a Hughes, and not that I'm against them, but after trying a number of things my problems keep pointing to the cam, that's why I'm changing it. Although it runs strong it has a poor idle and I can only get about 13.5 inches of vacuum at idle with 20 degrees initial and manifold vacuum to the advance. Also, it's noisy, I'm told that's not uncommon for a fast lift cam. I want a quiet valvetrain. the spec's on it are
intake exhaust
lobe .326 .349
valve .489 .524
219 degrees 228 degrees
Also, the engine is totally stock including the carb and distributor except for the Pertronix. Quote:
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Re: 1970 383 cam suggestions?
[Re: Dodgem]
#210266
02/01/09 05:03 PM
02/01/09 05:03 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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the Comp 268 or the Crower 267HDP are great 383 replacement cams and will give you the idle characteristics you are looking for. The Hughes you had is just a smidge big for a mild 383 but before tossing it I'd try a set of Crane or Lunait Hi-vac lifters, should knock about 6-8 degrees at .050 and pick up vacuum with no downside...I've run them in 11 second cars so no worries there.
Haven't run the Voodoo but being Harold for Ultradyne developed them that speaks very well for their pedigree. I've been happy with Lunati's before as well.
The MP 455 lift 268/272 Purple shaft is another good one
Last edited by Streetwize; 02/01/09 05:08 PM.
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Re: 1970 383 cam suggestions?
[Re: Dodgem]
#210267
02/01/09 05:07 PM
02/01/09 05:07 PM
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Joined: Jan 2003
Posts: 1,066
California
70SportSatellite
OP
super street
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OP
super street
Joined: Jan 2003
Posts: 1,066
California
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Quote:
Why would you put your vacuum advance to manifold vacuum?
Here we go! Although there are many who will disagree I'll explain. Please do not turn this post into a manifold v. ported debate though. Please begin a new post if you would like to discuss it further, thank you. I am replacing the cam and am sincerely seeking suggestions.
Anyway, by switching to manifold vacuum the idle quality improved, it burned cleaner, the water temperature lowered, the vacuum increased and it stopped pinging.
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Re: 1970 383 cam suggestions?
[Re: 70SportSatellite]
#210268
02/01/09 05:11 PM
02/01/09 05:11 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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 My cam suggestion is in....My retort would be why would anyone run venturi Vacuum? You want advance to come in under load and part throttle, high RPM speed the centrifugal kicks in. Manifold vacuum is where you want it 95% of the time anyway. I tell people 383's are more like smallbocks, they're easy to overcam if you're not careful  Gotta watch the intake closing event especially....go too far and you'll take away what little stroke you have to work with. also....since it's not too big....you might try advancing it +4 before swapping it out...that'll help your vacuum and low end...just a thought.
Last edited by Streetwize; 02/01/09 05:17 PM.
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Re: 1970 383 cam suggestions?
[Re: Streetwize]
#210269
02/01/09 06:57 PM
02/01/09 06:57 PM
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Joined: Jun 2006
Posts: 5,166
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,166
CT
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Id say try the 455 272 Purpleshaft suggested before.
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: 1970 383 cam suggestions?
[Re: GTX MATT]
#210270
02/01/09 07:19 PM
02/01/09 07:19 PM
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Joined: Aug 2004
Posts: 1,960
Kenosha, Wi
GOLDMYN
top fuel
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top fuel
Joined: Aug 2004
Posts: 1,960
Kenosha, Wi
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P4452783....the restro cam, works very good for me, everybody says "old grind", but, its an old car!!, plenty of vacuum for my PDB, great idle and no chugging at the stop signs
Semper Fi
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Re: 1970 383 cam suggestions?
[Re: High Impact]
#210271
02/01/09 08:41 PM
02/01/09 08:41 PM
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Joined: Nov 2008
Posts: 1,565
tennessee
pushbutton
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,565
tennessee
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Quote:
Stay away from the MP 284/484 
 Man, how I wish someone would have given me that advice a while back.
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