'383' ~ 1967 325 HP vs. 1968 330 HP vs. 1968 335 HP

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Now did the 1968 {383/330 HP} and 1967 {383/325 HP} Plymouth
B-Body cars match up in the NHRA in 1968 when the Stock Class
Weight Breaks were re-aligned.

Look at out how the 1968 Plymouth B-Body cars fit into the weight class.

1968 Plymouth ~ 383/330 HP
1968 - Belvedere 2-Door Sedan ....... #3419 lbs. ........ 10.36 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Hardtop' ................ #3445 lbs. ........ 10.44 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Convertible' ............ #3515 lbs. ......... 10.65 Wt/HP ...... F/S or F/SA
1968 - Sport Satellite 'Hardtop' ........ #3485 lbs. ......... 10.59 Wt/HP ....... F/S or F/SA
1968 - Sport Satellite 'Convertible' ... #3585 lbs .......... 10.86 Wt/HP ....... F/S or F/SA


1967 Plymouth ~ 383/325 HP
1967 - Belvedere 2-Door Sedan ..... #3460 lbs. .......... 10.64 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II' Hardtop ........ #3484 lbs. ........... 10.72 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II" Convertible .. #3556 lbs ............. 10.94 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Hardtop' .............. #3534 lbs ............ 10.87 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Convertible' ......... #3606 lbs. ........... 11.09 Wt/HP ..... G/S or G/SA
 
Now did the 1968 {383/330 HP} and 1967 {383/325 HP} Plymouth
B-Body cars match up in the NHRA in 1968 when the Stock Class
Weight Breaks were re-aligned.

Look at out how the 1968 Plymouth B-Body cars fit into the weight class.

1968 Plymouth ~ 383/330 HP
1968 - Belvedere 2-Door Sedan .... #3419 lbs. ..... 10.36 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Hardtop' ............. #3445 lbs. ..... 10.44 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Convertible' ......... #3515 lbs. ..... 10.65 Wt/HP ...... F/S or F/SA
1968 - Sport Satellite 'Hardtop' ..... #3485 lbs. ..... 10.59 Wt/HP ....... F/S or F/SA
1968 - Sport Satellite 'Convertible' . #3585 lbs ..... 10.86 Wt/HP ....... F/S or F/SA


1967 Plymouth ~ 383/325 HP
1967 - Belvedere 2-Door Sedan ... #3460 lbs. ....... 10.64 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II' Hardtop ...... #3484 lbs. ........ 10.72 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II" Convertible . #3556 lbs ......... 10.94 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Hardtop' ............ #3534 lbs ......... 10.87 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Convertible' ....... #3606 lbs. ........ 11.09 Wt/HP ..... G/S or G/SA

Fritz,

As you can see with the Plymouth's, the best car to run {weight break wise}, was the
1968 Sport Satellite 'Hardtop' with the 383/330 HP to get classed in F/S or F/SA in
1968.

Or, the 'heavier' 1967 Satellite 'Convertible' with the 383/325 HP to get classed down in
G/S or G/SA.

Be advised, that the 1968 Road Runner's {383/335 HP} were classed in E/S or E/SA.
 
Did N.H.R.A classes allow tire size/compound change/ chassis tuning ?!?!?, in these middleweight classes? This might make up, for some " horsepower factoring"....
 
Did N.H.R.A classes allow tire size/compound change/ chassis tuning ?!?!?, in these middleweight classes? This might make up, for some " horsepower factoring"....

Back in 1968.

NHRA Stock Class
Maximum Width Slicks .......... 7"
Shocks ............................... Any Type
Traction Bars ...................... Allowed
Engine Blueprinting
Dykes-type Piston Rings
Forged-True Pistons ............. Factory Rated Compression
Cylinder Heads .................... CC'd to NHRA Minimum Specs
Headers .............................. 3.5" Maximum-width collector
Stock Exhaust System .......... Had to be installed on car
Electric Fuel Pump ................ Allowed
Re-location of Battery to trunk. Allowed

Chassis tuning permitted. But, the cars were to maintain a 'level position'
at standstill.

Lots of guys were attempting to get a 7" travel {lift} from the front-end when
launching from the line.
 
Boston Bob,

No, the 383/335 HP {Road Runner / Super Bee} engine was never found
in the 1968 or 1968 Dodge Charger.

It was only the 'weak-sister' 383/330 HP.

That was too bad, as the Charger 383 should have been part of that package.
 
What I don't understand is that the 68 383 Roadrunner engine was rated at 335, the same as a 69 383 Magnum. I thought the Magnum was a hotter engine.
 
What I don't understand is that the 68 383 Roadrunner engine was rated at 335, the same as a 69 383 Magnum. I thought the Magnum was a hotter engine.

Bob,

They were the same Engine. The only thing different on the Engine,
was the Air-Cleaner 'Pie-Tin' nameplate.

The 383/335 HP {1968 and 1969}
* Plymouth name ........ 383 Road Runner Engine {Available in the Road Runner only}
* Dodge name............. 383 Magnum {Available in the Super Bee only}

Featuring
* Oil Pan Windage Tray
* 440 Camshaft
* 440 Valve Springs
* 440 Exhaust Manifolds
 
------------------------------------------------------------------------------------------------

1968 Casting #2843906
* Open Chamber ....... 79.5 CC's {Minimum} ~ 88.0 CC's {Factory}
* Intake Valve .......... 2.08"
* Exhaust Valve ........ 1.74"
* Intake Flow ............ 203 CFM @ .440"
* Exhaust Flow .......... 145 CFM @ .440"

Note;
The 'Open-Chamber' design provided improved flow, and offered lower emission's at low RPM levels.

Note;
With the 'Open-Chamber' design, there would be less shrouding of the
Valves, which lowered the turbulence within the Combustion Chamber.

Note:
The #906 Castings were listed with having 10% larger volume Intake Ports, which
included an improved flow-design with a radius-type design, as opposed to the
earlier flat-floor design. The #906 Casting Intake-Port provided for increased
performance at higher RPMs.

Note;
The #906 Castings were equipped with larger Exhaust Valves {1.74" to 1.60"},
which was an increase of {+8%} in size. The Valve-Bowl area was also increased to accommodate the larger valve.

Note;
The #906 Casting also had an improved design within the port, as there were less
restrictive bends, which improved flow {+18%}.

Looking at the "stock casting " airflow numbers...., I can see why just a good radius cutter/honest good valve job,really wakes the stock head castings up... Just wow,there was room 4 improvement.
 
Looking at the "stock casting " airflow numbers...., I can see why just a good radius cutter/honest good valve job,really wakes the stock head castings up... Just wow,there was room 4 improvement.

The #2843906 Cylinder Head 'responds greatly' to even the mildest improvements.
 
Boston Bob,

No, the 383/335 HP {Road Runner / Super Bee} engine was never found
in the 1968 or 1968 Dodge Charger.

It was only the 'weak-sister' 383/330 HP.

That was too bad, as the Charger 383 should have been part of that package.

The 383-335 horse applications vary by year. What happened in 68 may or may not apply in 69 and may or may not apply in 70.

Any 69 B body (Charger, Satellite, Coronet) with a four speed and without A/C received the 335 horse assembly as there was no four speed 330 horse assembly in 69 as there was in 68.

Any 69 B body with A/C received the 330 horse assembly. Any non Road Runner or Super Bee with an automatic received the 330 horse assembly. This is verified via broadcast sheets and Lynch Road fender tags.
 
Last edited:
The 'magical' 383

1967 383/325 HP ........... 1968 383/330 HP ............... 1968 383/335 HP
325 HP @ 4800 RPM's .......... 330 HP @ 5000 RPM's ........... 335 HP @ 5200 RPM's
425 Ft/Lbs. @ 2800 RPM's ... 425 Ft/Lbs. @ 3200 RPM's .... 425 Ft/Lbs. @ 3400 RPM's
-----------------------------------------------------------------------------------------

A general overview in the differences, and Horsepower Gain.

The 1967 ~ 383/325 HP was the 'base' 383 Performance Engine found
in all B-Body Mopars.
This was the same combination as the previous year {1966 Models}.

The 1968 ~ 383/330 HP was the 'base' 383 Performance Engine found in the
B-Body Models.
* Plymouth > Belvedere, Belvedere II, Satellite and Sport Satellite
* Dodge > Coronet, Coronet 440, Coronet 500 and 'base' Charger

The 1968 ~ 383/335 HP was the 'special' 383 Performance Engine found
only in the 'new' Road Runner and 'new' Super Bee.

Also in 1968, the 383 Engine found in the A-Body Cars {Barracuda
and Dart GTS} was rated at a low 300 Horsepower, due to a restrictive
Exhaust System.
300 HP @ 4400 RPM's
400 Ft/Lbs. @ 2400 RPM's

From what I`ve heard , there were 2, 330 horse 68 baracuda fastbacks that came out , because of engine shortages when they were built . I had one , it was almost uncontrollable on the tires of that period , only heard of one other . Even stated it on the window sheet, of course I didnt know what I had at the time !! Much less smart enough to save the window sheet -----
 
Now did the 1968 {383/330 HP} and 1967 {383/325 HP} Plymouth
B-Body cars match up in the NHRA in 1968 when the Stock Class
Weight Breaks were re-aligned.

Look at out how the 1968 Plymouth B-Body cars fit into the weight class.

1968 Plymouth ~ 383/330 HP
1968 - Belvedere 2-Door Sedan ....... #3419 lbs. ........ 10.36 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Hardtop' ................ #3445 lbs. ........ 10.44 Wt/HP ....... E/S or E/SA
1968 - Satellite 'Convertible' ............ #3515 lbs. ......... 10.65 Wt/HP ...... F/S or F/SA
1968 - Sport Satellite 'Hardtop' ........ #3485 lbs. ......... 10.59 Wt/HP ....... F/S or F/SA
1968 - Sport Satellite 'Convertible' ... #3585 lbs .......... 10.86 Wt/HP ....... F/S or F/SA


1967 Plymouth ~ 383/325 HP
1967 - Belvedere 2-Door Sedan ..... #3460 lbs. .......... 10.64 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II' Hardtop ........ #3484 lbs. ........... 10.72 Wt/HP ...... F/S or F/SA
1967 - Belvedere 'II" Convertible .. #3556 lbs ............. 10.94 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Hardtop' .............. #3534 lbs ............ 10.87 Wt/HP ..... F/S or F/SA
1967 - Satellite 'Convertible' ......... #3606 lbs. ........... 11.09 Wt/HP ..... G/S or G/SA

I dont know about this ^^^^^^^^we put a 68 426 hemi in a 66 belvedere , and it was dam near 4000 pounds , took a heck of a bunch to get it down to nhra legal weight limit !!
 
I miss 69 440 Cuda's post. Such a knowledgeable person and was a huge asset for this forum.
I looked forward to Paul's Match Race threads like a little kid on Christmas morning. Agree, he is definitely missed around here. His involvement (and his family) in NHRA racing made for great reading.
 
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