1968 Mopar Street-Race ~ Road Runner 383 vs. GTX 440

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03JeepJeep said:
GTX though a bit heavy, the 440 would have better top end.
Click to expand...

That Would Be Correct

With both running 727 Automatics and 3.91 Gears.

The Road Runner 383 would clearly get the better of the two 'out-of-the-hole'. And
more than hold it's own thru mid-track.

The {139 lb.} lighter weight and higher stall-rate Converter would give the
higher revving 383 a nice advantage on the bottom-end.

But, the GTX with the 'big ol' 440 would start to breathe by mid-track, and
pull even at the end of Mid-Range.

On Top-End, forget about it. ............ 440 'Super Commando'
 
69 Cuda 440 said:
That Would Be Correct

With both running 727 Automatics and 3.91 Gears.

The Road Runner 383 would clearly get the better of the two 'out-of-the-hole'. And
more than hold it's own thru mid-track.

The {139 lb.} lighter weight and higher stall-rate Converter would give the
higher revving 383 a nice advantage on the bottom-end.

But, the GTX with the 'big ol' 440 would start to breathe by mid-track, and
pull even at the end of Mid-Range.

On Top-End, forget about it. ............ 440 'Super Commando'
Click to expand...

Sounds right
 
69 Cuda 440 said:
That Would Be Correct

With both running 727 Automatics and 3.91 Gears.

The Road Runner 383 would clearly get the better of the two 'out-of-the-hole'. And
more than hold it's own thru mid-track.

The {139 lb.} lighter weight and higher stall-rate Converter would give the
higher revving 383 a nice advantage on the bottom-end.

But, the GTX with the 'big ol' 440 would start to breathe by mid-track, and
pull even at the end of Mid-Range.

On Top-End, forget about it. ............ 440 'Super Commando'
Click to expand...

I thought we were talk'n street race, not 1/4 mile. lol I think the RR wins in the 1/8
 
1968

The Carter AVS {630 CFM} Carburetor did the 383 {no favors} at Top End.

The Big-Block literally starved for Fuel over 4500 RPM's.

Now, pop on an 'Edelbrock' Dual-Plane Aluminum High-Rise Intake and a
'Holley' 780 CFM w/Vacuum Secondaries.........

And we've got a closer and more competitive Race.
 
69 Cuda 440 said:
Getting those correct '1968' Shipping Weight numbers

Road Runner 383
* Automatic .... #3424 lbs.
* 4-Speed ....... #3461 lbs.

GTX 440
* Automatic ..... #3563 lbs.
* 4-Speed ....... #3666 lbs.

Note; The GTX 440 {4-Speed} came thru the Dana Rear. {Es mucho weight}
Click to expand...

Johnny Jocko

1968 NHRA Classes

* Road Runner 383 {383/335 HP} ......... E/S or E/SA ..... {10.00 to 10.49 Wt/HP}

* GTX 440 {440/375 HP} ..................... D/S or D/SA ..... {9.50 to 9.99 Wt/HP}

I'll post up the NHRA National Records for you.

* E/S .......... 12.70 @ 107.47
* E/SA ........ 12.79 @ 109.75

* D/S .......... 12.39 @ 113.63
* D/SA ........ 12.49 @ 112.50
 
Bungee Bob

To make all things equal,

The Road Runner 383 would require an Edelbrock Aluminum Intake Manifold,
a Holley {780 CFM} Carburetor, and Headers to stay even with the GTX 440
at the Track.

That is with both having the same Rear-End Gears.
 
69 Cuda 440 said:
Bungee Bob

To make all things equal,

The Road Runner 383 would require an Edelbrock Aluminum Intake Manifold,
a Holley {780 CFM} Carburetor, and Headers to stay even with the GTX 440
at the Track.

That is with both having the same Rear-End Gears.
Click to expand...

Pretty much ,sums it up,69 440.. Back in the 383 Magnum Coronet revival( reringed low buck 383 Mag,lapped valves ,re ringed short block.bigger capacity oil pan, worked oiling system) We slapped a TM7 /3310 up top, Magnum manifolds ,with big exhaust (3"she screamed,lol) Scary part: It worked( Road Runner converter, 3:23's..).. It went 13:90'/14:00 's in 100 degree heat at Famoso..No head work, basic attention ,to what's needed, it only comes from education & experience...
 
Abodybomber said:
Pretty much ,sums it up,69 440.. Back in the 383 Magnum Coronet revival( reringed low buck 383 Mag,lapped valves ,re ringed short block.bigger capacity oil pan, worked oiling system) We slapped a TM7 /3310 up top, Magnum manifolds ,with big exhaust (3"she screamed,lol) Scary part: It worked( Road Runner converter, 3:23's..).. It went 13:90'/14:00 's in 100 degree heat at Famoso..No head work, basic attention ,to what's needed, it only comes from education & experience...
Click to expand...

Correct,

The Carter AVS {630 CFM} was the 'Air/Fuel Restrictor' on the 383.

The 383 needed a #3310 Holley 780 CFM to run at higher RPM's to unleash
that hidden Horsepower.

It was worth about +15 HP.
 
Dink-Man

The Mopar combination to run at the track back in 1968, the GTX 440 with
an Automatic.

NHRA Stock Class ....... D/SA

NHRA Super Stock Class ..... Either SS/F or SS/FA
 
Dink-Man

Based on cost and ease of street drive-ability, the Road Runner 383 was the way to go.

Plus, for about $400 you could make them wheel fairly quick, and not have to worry
about breaking anything.
 
fishmens67 said:
ok, your race and your street. I missed it . I was waiting at the stop light. you spin, you lose!
Click to expand...

1968 ....... Quickest 'Off-the-Lot' Mopar Street Performers

* Road Runner - '426 Hemi' {425 HP}
* Super Bee - '426 Hemi' {425 HP}
* GTX - '426 Hemi' {425 HP}
* Coronet R/T - '426 Hemi' {425 HP}
* GTX - 440 {375 HP}
* Coronet R/T - 440 {375 HP}
* Charger R/T - '426 Hemi' {425 HP}
* Charger R/T - 440 {375 HP}

* Barracuda - 340 {275 HP}
* Dart GTS - 340 {275 HP}
* Road Runner - 383 {335 HP}
* Super Bee - 383 {335 HP}
* Barracuda - 383 {300 HP}
* Dart GTS - 383 {300 HP}

* Belvedere - 383 {330 HP}
* Coronet - 383 {330 HP}
* Satellite - 383 {330 HP}
* Coronet 500 - 383 {330 HP}
* Charger - 383 {330 HP}

* Sport Fury - 440 {375 HP}
* Polara 500 - 440 {375 HP}
* Monaco 500 - 440 {375 HP}
 
69 Cuda 440 said:
1968 ....... Quickest 'Off-the-Lot' Mopar Street Performers

* Road Runner - '426 Hemi' {425 HP}
* Super Bee - '426 Hemi' {425 HP}
* GTX - '426 Hemi' {425 HP}
* Coronet R/T - '426 Hemi' {425 HP}
* GTX - 440 {375 HP}
* Coronet R/T - 440 {375 HP}
* Charger R/T - '426 Hemi' {425 HP}
* Charger R/T - 440 {375 HP}

* Barracuda - 340 {275 HP}
* Dart GTS - 340 {275 HP}
* Road Runner - 383 {335 HP}
* Super Bee - 383 {335 HP}
* Barracuda - 383 {300 HP}
* Dart GTS - 383 {300 HP}

* Belvedere - 383 {330 HP}
* Coronet - 383 {330 HP}
* Satellite - 383 {330 HP}
* Coronet 500 - 383 {330 HP}
* Charger - 383 {330 HP}

* Sport Fury - 440 {375 HP}
* Polara 500 - 440 {375 HP}
* Monaco 500 - 440 {375 HP}
Click to expand...

Tony T-N-T

Yes, you could get the 440/375 HP in the above '3' Big-Body Cars.
 
What the Super High Performance 383 option could have been...mighta changed Mopar history as we know it. Bench racing for sure.
 
fratzog lover said:
What the Super High Performance 383 option could have been...mighta changed Mopar history as we know it. Bench racing for sure.
Click to expand...

I like the way you think Mr. Fratzog.

It would been have nice with '4' versions

* 383 ........ 4-Barrel
* 383 ........ 'High Performance' ....... 383/335 HP

Added Optional Engine Packages ~

* 383 ......... 'Package Stock Option'
* 484" Lift / 284* Duration Camshaft 'Hydraulic'
* Friction Free Lifters {.0005" under-size}
* High-Strength Stamped Steel 'non-adjustable' Rocker Arms
* Edelbrock Aluminum Intake
* Holley 780 CFM Carbretor
* Dual-Point Distributor
* High-Performance Ignition Wiring
* High-Strength Timing Chain
* High Capacity Cooling System

* 383 ........ 'Coyote Duster Package' .... available only in the Road Runner
* 490" Lift / 292* Duration Camshaft 'Mechanical'
* Friction Free Lifters {.0005" under-size}
* 300 lb. Load-Rate Valve-Springs
* High-Strength Valve Train {Rocker Arms and Pushrods}
* 11.0-1 TRW Forged Pistons
* Full-Floating Piston Pins
* Shot-Peened Rods
* Tuftrided Crankshaft
* Balanced Internals
* Double-Roller Timing Chain
* High-Volume Oil Pump
* Edelbrock Aluminum Intake
* Holley 780 CFM Carburetor
* Dual-Point Distributor
* High Performance Ignition Wiring
* Complete 440 {2 1/2" Pipe} Exhaust System
* 3.91 Gears {Automatic}
* 4.10 Gears {4-Speed}
* 15" x 6" Magnum 500 Wheels
* G70 x 15" Tires {Front}
* G60 x 15" Tires {Rear}
* 'Drag-Shocks'
* High-Pressure Fuel Pump
* Trunk Mounted Battery
* Fiberglass Hood, with Under Hood Fresh-Air Induction
* Adjustable Pinion Snubber
* High Capacity Cooling System
* 'Hooker Headers' in Trunk Compartment
 
So if the 630 cfm carb on the 383 RR engine was too small what did the 440 Magnums come with?
 
MOPEkidD-3 said:
So if the 630 cfm carb on the 383 RR engine was too small what did the 440 Magnums come with?
Click to expand...

Carter AVS Carburetors

383
Primary ........ 1 7/16"
Secondary .... 1 11/16"
CFM Rating .... 630

440
Primary ........ 1 11/16"
Secondary .... 1 11/16"
CFM Rating ..... 750
 
Didn't know,the 440 AVS,was rated at 750.... Not bad,for a 383.. Still like the 3310 Holley,on almost everything . ( so versatile..)
 
When I first got my 69 Roadrunner it had the 383 mag and it ran really nice, but when I swapped to the 440 mag it was obvious that the 440 had a lot more guts.
Same car, same weight, quite a bit faster.

I'll also go with the GTX
 
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