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  #1  
Old 09-03-2003, 03:32 PM
BILL STRASSBERG's Avatar
BILL STRASSBERG BILL STRASSBERG is offline
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Biggrin 383 Magnum Vs 440

Iam installing a stock 383 magnum in my 67 Coronet, my brother has a 69 Roadrunner with 440. I would love for my car to beat his, he claims it runs a 13.5 1\4 mile. What would I need to do to the 383 to make it run faster or dam close? A suggestions would be great..
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  #2  
Old 09-03-2003, 08:43 PM
beepbeepsrule beepbeepsrule is offline
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4.10 sure-grip rear.
.484/284 to .509/292 (or close) cam.
headers.
open intake.
good carb, 750 or so.
good ignition, one that can keep up past 6000 rpm.
optimize lifter preload for 6500 rpm.
probably need an electric helper fuel pump in the rear.
if automatic may need 2400 or better stall converter.
Tachometer.

You will have to wing yours above 6000 rpm to be able to run with a 440. Remember you have the same heads he does so the peak HP can be about the same because the 440 will quit pulling harder after 5500 while your 383 pulls harder and harder past 6500 until it blows up. 3's LOVE rpm and the magnum heads are about perfect. 40's can idle straight up a tree trunk but really need a bigger head to pull real rpm.

Main focus for you should be the 5000 to 6500 range, anything to optimize for that and your car will be right there and maybe pulling ahead at the end of the 1/4. It may not be as streetable as you like, though.
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Old 09-03-2003, 09:05 PM
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I have a 70 roadrunner 383 with 4.56 dana and 484/284 cam,700 d.p.,alum.dual plane,headers,orange ignition box,high volume mech.fuel pump.Mine runs high 13's open headers with M/T et streets 30x12's and 2200 converter.Mine doesnt seem to want to pull much over 5500 and it has good double springs and i advanced the cam 4 degs.and that didnt help.Wonder if im running out of ignition or fuel?It doesnt miss,just seems down on power,and advice?
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Old 09-04-2003, 12:27 AM
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Bill, I saw a cool article in car craft, where a guy had made a 430, out of his 383 by using a 440 crank, and going .030 over.

Sort of the same idea as a 451

The article was called "8 dyno proven combos" I think? I moght be wrong on the number.

It made really good power. Still looks like a 383, no way to tell.
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  #5  
Old 09-04-2003, 08:32 PM
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Quote:
Originally posted by jst19600
Mine doesnt seem to want to pull much over 5500 and it has good double springs and i advanced the cam 4 degs.and that didnt help.]
Why did you advance it 4 deg if topend was what you wanted? Retard the cam or run around 110-112 centerline from what your running!
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Old 09-04-2003, 09:04 PM
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I really dont think its a cam issue,i may be wrong.I was told advancing it 4 degs is reutine on cams such as that.Any way,it didnt make any difference at all.Maybe thats all she has in it as heavy as it is.
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Old 09-04-2003, 10:34 PM
Junky Junky is offline
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A good Crower cam.

At least a torque converter that stalls at no less than 2,800, 3,000 to 3,400 would be better!

4.10 rear gears.

MSD Ready-To-Run, Pro Billet distributor...needs no box. MSD part number 8386. You won't be sorry.

Edelbrock RPM intake, 750 Holley carb.

Good fuel pump.

TTI headers with 3" exhaust, Dynomax Hemi mufflers, X-pipe.

TransGo shift kit if auto trans.

Switch to manual steering if possible.

Cost will be reasonable and car should run in the low 13's if tuned right.

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Old 09-04-2003, 10:49 PM
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Glen440 Glen440 is offline
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My friend had a 69 Coronet with a 383 with the .484 cam and 4.10 gears and it ran 12.6@110mph. All things equal the 440 will kill the 383. A 383 with the .484 should pull 6500 without a prob.
Advancing a cam kills the top end, in general doesn't help anything but low rpm driveability.
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Old 09-04-2003, 11:12 PM
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70 Roadrunner/383 stock 9.5 to 1/906 stock heads new reconditined with isky springs/edelbrock performer/holley 700 d.p./headers/fan clutch/orange e.c.u./stock 5/16 fuel line with h.p.fuel pump/4.56 dana rear with 30" M/T et streets/full interior/484 cam advanced 4 degs./best e.t.13.75@101mph open headers.Mopar electronic distributor.Does not want to pull above 5500.It will but not quickly.Shift it at 5800 and go thru 1/4 at 5000.Why wont she pull at higher RPM's?
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  #10  
Old 09-05-2003, 09:27 AM
beepbeepsrule beepbeepsrule is offline
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Ignition and valve float are the main RPM limiters. You didn't describe many symptoms (popping, surging, general flatness) so it is hard to guess what may be limiting your engine. Your rev problem may be a combination of factors.

I have had a 383 with the orange ECU go to 6500 but that is supposed to be beyond it's range. An MP chrome box with a MSD blaster2 or Accel superstock coil would be better. This engine was a magnum with .509/292 purple shaft, torker383 intake, 750 3310 Holley, headers, MP orange ignition, Accel superstock coil. The valvetrain was absolutely stock, not even shimmed. It also had the stock 5/16 fuel line with a small electric at the rear pushing to the stock mechanical up front. I figured it might starve for fuel but it didn't. It revved like every time would be the last time.

I believe an open plenum intake is best for 5500+ rpms. If the EB performer is a dual plenum then that would make it flatten out above 5500 I would think.

Every 383 I have been around wanted to go past 6000 with a vengeance even with the "stock" magnum spec cam and intake.
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  #11  
Old 09-05-2003, 09:39 AM
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jst19600

I think your problem is in just what you described...the 5/16" fuel line! The stock 5/16" line is way too small for a warmed up big block and it has got more curves than a roller coaster. Think about it, that high volume pump needs to pull more gas from your tank and with your cars momentum working in the oposite direction your pump needs to work extra hard to suck more gas out of that tiny straw. Upgrade to at least a 3/8" line and I bet that will solve your problems. 3/8" line was stock on all 6 pack and hemi cars.
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