Re: RPM Redline for stock 383/4bbl
[Re: Real-Fury]
#441307
08/17/09 10:10 PM
08/17/09 10:10 PM
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Joined: Jan 2003
Posts: 20,726 A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,726
A collage of whims
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Some of my stock 383s were stronger than others, sometimes by a margin large enough to be baffling. Usually they run out of pull around 5200-5500 RPM. For a street car with 3.23s, I'd tweak it for torque. A really sharp tuneup, good dual exhaust with H or X pipe, better ignition, Eddy AVS-style carb, and 1.6 rockers & better valve springs would be my first mods. After that maybe a more modern cam profile and either HP exhaust manifolds or smallish headers, but it won't look so stock anymore. If you plan on enjoying the power, the 10" brakes aren't really up to the task, and I'd put some swaybars on it.
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Re: RPM Redline for stock 383/4bbl
[Re: Real-Fury]
#441310
08/18/09 12:46 AM
08/18/09 12:46 AM
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Joined: Feb 2003
Posts: 10,198 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,198
Someplace you aren't
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What cam do you even have? If it is a stock then a cam change is pretty a pretty good for a street car.
A gear change will only get the car to shift gears sooner at the track and not really do anything for you if you don't run a large cam.
It may feel faster if that is what you want, but members have posted in the past that a gear change resulted in less than a tenth change in ET for a mild combo. We are talking a 3.23 to a 3.91, not really worth it unless you are going to get real agressive on a cam. Then the gear gets more important.
If you are asking what the bottom end will take, this ain't no Chevy. It should be good to 6000 unless it is worn out, then all bets are off. The cam/springs will limit how high you can turn it though.
I want my fair share
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Re: RPM Redline for stock 383/4bbl
[Re: Real-Fury]
#441311
08/18/09 09:16 AM
08/18/09 09:16 AM
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Joined: May 2009
Posts: 130 Blanchard, OK
Real-Fury
OP
member
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OP
member
Joined: May 2009
Posts: 130
Blanchard, OK
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Great responses and very helpful. This is supposed to be a bone stock 383 and I have no reason to doubt it. Bought it represented to have 39000 miles which was on the Title (I know big deal) but every part of the car looks it. Engine revs surprisingly quick up and down which also supports the low mileage claim. But, regardless, its 45 years old and the motor isn't a spring chicken anymore. Absolutely stock under the hood including the foil heat barrier underneath the intake. This will always be a street cruiser and not a race car while I own it but like everyone else I like to punch it and feel the power. I expect one of these days I'll be locking horns with one of the little imports on the street and would like to have a presentable showing for the old gal. But, the old saw seems to be just as true today as it was 40 years ago. "Speed cost money--how fast do you wanna go?" Love to put a stroker, upgraded 4 speed A/T trans and converter with a 65-67 suregrip and higher gears, but that's another $15-20k by the time the brakes, suspension and other items are upgraded to match the power. Not sure I can justify that as I don't have that many years of driving this type car left in me and what I see the modified 64's bringing (or not bringing) these days is pretty sad. Guys are lucky to get half their money back. So, I GUess I'll take this a little at a time and see where it leads me. I'll change out the intake, carb, maybe headers or HP manifolds (by the way are these manifolds almost as good as headers) and definitely some suspension updates. I sure don't remember the 60's cars driving so loose and sloppy. Kinda like driving a boat. I've added HD shocks so hopefully some swaybars and better tires will help. I just know one thing leads to another and it's hard to just do one upgrade without wanting or having to do several others. So, I guess we're off to see the wizard! Any other recommendations are greatly appreciated especially on which mods to do 1st. Butch
Last edited by Real-Fury; 08/18/09 12:40 PM.
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Re: RPM Redline for stock 383/4bbl
[Re: Thackdaddy]
#441314
08/18/09 12:56 PM
08/18/09 12:56 PM
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Joined: May 2009
Posts: 130 Blanchard, OK
Real-Fury
OP
member
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OP
member
Joined: May 2009
Posts: 130
Blanchard, OK
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I like the 383 if only because they used to beat me in the 60's when I was driving 327 chevy's. I know the new rule is bigger is better but I can't believe a 383 can't be made to run strong and compete with the other big blocks without breaking the bank. Butch
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Re: RPM Redline for stock 383/4bbl
[Re: Mr.Yuck]
#441320
08/18/09 07:56 PM
08/18/09 07:56 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Call Summit order their 488 cam, find a used Holley SD intake, 750Dp carb, headers and an electronic ing kit. Set your timing at 38* at 2400 rpm, get a set of 3.91's and go have fun. Should spin to 5800 easy.
It may do it but it will be going nowhere fast. 5-5500 on that engine and its done..... Hell the magnums were done at 58-6000 tops stock. Yeah I know there will be some one that will say that they had one and it would twist 7000 and was till going. Wasn't gonna happen.
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Re: RPM Redline for stock 383/4bbl
[Re: Real-Fury]
#441324
08/19/09 08:48 PM
08/19/09 08:48 PM
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Joined: Nov 2006
Posts: 1,456 oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,456
oklahoma
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Quote:
Thanks Furious70,
That's a very interesting article and some very impressive information. 450hp out of a 383 with just a change of cam, intake, carb and headers is pretty remarkable. That's the kind of performance I was hoping this engine could produce and is plenty of HP for me on the street. I hope the stock lower end can handle the increased power.
Butch
Steve Dulcich, the writer for that article, really knows his stuff and his articles are very informative. The performance of that engine is impressive , but keep in mind that is a pretty hot cam in it. Low speed performance would probably be sluggish without at least a 3500 stall torque convertor. 4000+ would probably be best . From reading your post i get the impression you are wanting more of a cruiser and that cam may be a little more radical than you would like.
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