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

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69 Cuda 440

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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
 
Paul, as far as internal mechanical differences, besides the camshaft, wouldn't the 67 versions have the
small chamber cylinder heads as opposed to the 68's & 69's?
 
Old Man Mopar said:
Paul, as far as internal mechanical differences, besides the camshaft, wouldn't the 67 versions have the
small chamber cylinder heads as opposed to the 68's & 69's?
Click to expand...

Yes,

The 1967 383/325 HP had;
> #2406516 Cylinder Heads
> Restrictive {Driver-Side} Exhaust Manifold
> Low-Rise Intake Manifold
> Carter AFB {575 CFM rated}
> 4-Blade Fan {Direct mount to Water Pump}

The 1967 383/325 HP and 1968 383/330 HP had the same;
> Compression Ratio {10.0-1}
> Camshaft {.425"/.437" Lift ~ 256*/260* Duration ~ 32* Overlap}
> Valve Springs {#134 lbs. Valve-Closed ~ #208 lbs. Valve Open}

The 1968 383/330 HP {non Road Runner and Super Bee 383/335 HP} sure had a
few more ingredients over the 1967 383/325 HP

List to come
 
1st Comparison

1967 ...... 383/325 HP ... 325 HP @ 4800 RPM's
vs.
1968 ...... 383/330 HP ... 330 HP @ 5000 RPMs

There was a 'slight' difference in the reciprocating assemblies.

Year ................. 1967 .................................. 1968 ..............
Deck Height ..... {-.014"} Below Deck ........... {+.021} Above Deck

But, the Compression Ratio's were identical with the Flat-Top Pistons > 10.0-1
---------------------------------------------------------------------------------------

Also, the Camshafts 'Hydraulic' were identical.
* Lift ............ .425"/.437"
* Duration ..... 256*/260*
* Overlap ...... 32*

As well as the Valve Springs {Single-Coil}
> #134 lbs. @ 1.86" > {Valve-Closed}
> #208 lbs. @ 1.43" > {Valve-Open}
---------------------------------------------------------------------------------------
 
69 Cuda 440 said:
1st Comparison

1967 ...... 383/325 HP ... 325 HP @ 4800 RPM's
vs.
1968 ...... 383/330 HP ... 330 HP @ 5000 RPMs

There was a 'slight' difference in the reciprocating assemblies.

Year ................. 1967 .................................. 1968 ..............
Deck Height ..... {-.007"} Below Deck ........... {+.014} Above Deck

But, the Compression Ratio's were identical with the Flat-Top Pistons > 10.0-1
---------------------------------------------------------------------------------------

Also, the Camshafts 'Hydraulic' were identical.
* Lift ............ .425"/.437"
* Duration ..... 256*/260*
* Overlap ...... 32*

As well as the Valve Springs {Single-Coil}
> #134 lbs. @ 1.86" > {Valve-Closed}
> #208 lbs. @ 1.43" > {Valve-Open}

Note;
The Valve-Train was noted to be the weak-link with this combination, as
the Engine would experience Valve-Float when going over 4800 RPM's.
---------------------------------------------------------------------------------------
Click to expand...

The Heads

1967 Casting #2406516
* Closed Chamber ...... 73.5 CC's {Minimum} ~ 79.0 CC's {Factory}
* Intake Valve ........... 2.08"
* Exhaust Valve ......... 1.60"
* Intake Flow ............. 192 CFM @ .440" Lift
* Exhaust Flow ........... 124 CFM @ .440" Lift

Note;
The #516 Castings were noted for having a smaller-volume Intake Port with a
'flat-floor' design.

Note;
The #516 Castings were noted for having restrictive-curves within the Exhaust Port.
 
69 Cuda 440 said:
The Heads

1967 Casting #2406516
* Closed Chamber ...... 73.5 CC's {Minimum} ~ 79.0 CC's {Factory}
* Intake Valve ........... 2.08"
* Exhaust Valve ......... 1.60"
* Intake Flow ............. 192 CFM @ .440" Lift
* Exhaust Flow ........... 124 CFM @ .440" Lift

Note;
The #516 Castings were noted for having a smaller-volume Intake Port with a
'flat-floor' design.

Note;
But, the 'Closed-Chamber' design of the #516 Casting, provided for 'a tight quench', which helped develop better compression and power.

Note;
The #516 Castings were noted for having restrictive-curves within the Exhaust Port.
Click to expand...
------------------------------------------------------------------------------------------------

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%}.
 
Eddie Blay,

According to Mopar. With all things being equal, the #2843906 Cylinder Head
could put out {+11 HP} over the #2406516 Cylinder Head in a 'stock' 383 Engine
measured at 4800 RPM's

Up to 2800 RPM's, there was no significant difference in Horsepower.

But, at 3000 RPM's the increase in power started to develop.
 
Hay Paul, do you happen to have the compression height for those 1968 positive deck height pistons?
 
RustyRatRod said:
Hay Paul, do you happen to have the compression height for those 1968 positive deck height pistons?
Click to expand...

1968 and 1969 ~ 383 {10.0-1 Compression Ratio}
Deck Height .................... +.021" {Above Deck}
Compression Height .......... 1.934"

1967 and earlier ~ 383 {10.0 -1 Compression Ratio}
Deck Height ..................... -.014" {Below Deck}
Compression Height .......... 1.908"
 
Hipolito,

Regarding the Mopar 1967 ~ 383/325 HP.

NHRA has re-factored it from 325 HP down to .... 280 HP

1967 Shipping Weights ............................ 2015 Factor ..... 1967 Factor
Belvedere 2-Door Sedan.............. #3460 lbs. ...... 12.36 ......... 10.64
Belvedere 'II' Hardtop ................ #3497 lbs. ...... 12.44 .......... 10.72
Belvedere 'II" Convertible ........... #3556 lbs. ...... 12.70 .......... 10.94
Satellite 'Hardtop' ...................... #3534 lbs. ...... 12.62 .......... 10.87
Satellite 'Convertible' ................. #3606 lbs. ....... 12.88 ......... 11.09

Coronet Deluxe 2-Door Sedan ..... #3478 lbs. ....... 12.42 ......... 10.70
Coronet 440 'Hardtop'................. #3497 lbs. ....... 12.49 ......... 10.77
Coronet 440 'Convertible' ........... #3588 lbs. ....... 12.81 .......... 11.04
Coronet 500 'Hardtop' ................ #3572 lbs. ....... 12.76 .......... 10.99
Coronet 500 'Convertible' ........... #3647 lbs. ....... 13.02 .......... 11.22
 
69 Cuda 440 said:
Hipolito,

Regarding the Mopar 1967 ~ 383/325 HP.

NHRA has re-factored it from 325 HP down to .... 280 HP

1967 Shipping Weights ............................ 2015 Factor ..... 1967 Factor
Belvedere 2-Door Sedan.............. #3460 lbs. ...... 12.36 ......... 10.64
Belvedere 'II' Hardtop ................ #3497 lbs. ...... 12.44 .......... 10.72
Belvedere 'II" Convertible ........... #3556 lbs. ...... 12.70 .......... 10.94
Satellite 'Hardtop' ...................... #3534 lbs. ...... 12.62 .......... 10.87
Satellite 'Convertible' ................. #3606 lbs. ....... 12.88 ......... 11.09

Coronet Deluxe 2-Door Sedan ..... #3478 lbs. ....... 12.42 ......... 10.70
Coronet 440 'Hardtop'................. #3497 lbs. ....... 12.49 ......... 10.77
Coronet 440 'Convertible' ........... #3588 lbs. ....... 12.81 .......... 11.04
Coronet 500 'Hardtop' ................ #3572 lbs. ....... 12.76 .......... 10.99
Coronet 500 'Convertible' ........... #3647 lbs. ....... 13.02 .......... 11.22
Click to expand...

Pete,

In 1967, no matter what 'basic' B-Body Mopar you had with the 383/325 HP, you
were classed in C/S or C/SA in the NHRA.

1967 NHRA Stock Class
* C/S or C/SA ......... 10.60 to 11.29 Wt/HP
 
1967 Intake Manifold vs. 1968 Intake Maniold

1967 Casting #2205968
* Design > Dual-Plane
* Profile > Low-Riser
* Manifold Height > 2.80"
* Throttle Bore Sizes ...... 1 7/16" x 1 9/16"

1968 Casting #2806310
* Design > Dual-Plane
* Profile > Medium-Riser
* Manifold Height > 3.44"
* Throttle Bore Sizes ..... 1 11/16" x 1 11/16"

Advantages >
The 1968 Casting is a taller {rise} Manifold.
The 1968 Casting has 10% greater Branch-length.
The 1968 Casting has a 50% increase in Runner CFM volume.

The 1968 Intake was designed for greater flow at Mid-Range and Upper-Range
RPM power-surges.
 
69 Cuda 440 said:
1968 and 1969 ~ 383 {10.0-1 Compression Ratio}
Deck Height .................... +.021" {Above Deck}
Compression Height .......... 1.934"

1967 and earlier ~ 383 {10.0 -1 Compression Ratio}
Deck Height ..................... -.014" {Below Deck}
Compression Height .......... 1.908"
Click to expand...

Thank you kind sir. You are certainly full of.......









..................specifications. LOL
 
The 68's 335hp had the AVS carb #4426 on the 4 speed, and slightly better intake along with the windage tray , open air cleaner with the hipo exhaust manifolds with H pipe.
 
EL5DEMON340 said:
The 68's 335hp had the AVS carb #4426 on the 4 speed, and slightly better intake along with the windage tray , open air cleaner with the hipo exhaust manifolds with H pipe.
Click to expand...

1967 ~ 383/325 HP ......... 1968 ~ 383/330 HP ......... 1968 ~ 383/335 HP
* 4-Blade Fan {17" Dia.} ...... 7-Blade Fan {18" Dia.} ........ 7-Blade Fan {18" Dia.}
* Direct Mount ....................... Direct Mount ....................... Fan-Clutch

* Standard Oil-Pan ................. Standard Oil-Pan ............... Windage Tray
 
In late 66 I had a dark green sat 383 4bbl torqflyte, 3.23 suregrip.
That car was pretty quick and fast, but I never knew what HP and Tor it had.
How does it compare to the 67?
Thanks, cudamike

P.S. My Plymouth was a 66 !
 
cudamike13 said:
In late 66 I had a dark green sat 383 4bbl torqflyte, 3.23 suregrip.
That car was pretty quick and fast, but I never knew what HP and Tor it had.
How does it compare to the 67?
Thanks, cudamike

P.S. My Plymouth was a 66 !
Click to expand...

Cuda-Mike,

Both the 1966 and 1967 ~ 383/325 HP had the same components and output
listed by the Factory.

325 HP @ 4800 RPM's
425 Ft/Lbs. @ 2800 RPM's

But 'back-in-the-day' independent dyno-testing put the 1966 and 1967
383 4-Barrel between 278 and 286 HP.
 
Carburetor vs. Carburetor

...................1967 ~ 383/325 HP ......... 1968 ~ 383/330 HP and 383/335 HP
Type ..........................AFB ..................... AVS
Part #.......................#4298S {M/T} ...... #4426S {M/T}
Part # ......................#4299S {A/T} .......#4401S {A/T}
CFM Rating ................. 566..................... 630
Primary ...................... 1 7/16" ............... 1 7/16"
Secondary .................. 1 9/16"................ 1 11/16"
Primary Venturi ........... 1.186" ................ 1.186"
Secondary Venturi ....... 1.313" ................ AV
Main Jet ..................... 0.89" .................. 0.89"
Secondary Jet ............. 0.695" ................ 0.92"
Metering Rod ............. .063" x .051" ....... .065" x .060" x .053"
 
Find the 5 Horsepower Difference

1967 ~ 383/325 HP ........................... 1968 383/330 HP {'Base' 383 4-Barrel}

325 HP @ 4800 RPM's ........................ 330 HP @ 5000 RPM's

Cylinder Heads .... #2406516 ............. #2843906
Intake Valve ........ 2.08" ..................... 2.08"
Exhaust Valve ...... 1.60" ..................... 1.74"

Intake Manifold ... #2205968 ............... #2806301
Height ................ 2.80" ...................... 3.44"
Branch Length..................................... 10% Greater Length
Runner Volume ................................... 50% Greater CC Volume

Carburetor ........ AFB .......................... AVS
CFM Rating ....... 566 .......................... 630
Primary ............ 1 7/16" ..................... 1 7/16"
Secondary ........ 1 9/16" ..................... 1 11/16"

Air Cleaner ....... 'Unsilenced' ................ 'Dual Snorkel'

Exhaust Manifold ... #2532626 {L} ........ #2843992 {L}
Exhaust Manifold ... #2532464 {R} ....... #2532464 {R}

Header Outlet Size . 2.25" {2 1/4"} ...... 2.25" {2 1/4"}

Note; The Driver-Side Exhaust Manifold for the 1968 Models was improved,
with a 'wind-swept design' with less-restrictive bends which improved
exhaust flow by 40%.

Tail Pipes .............. 2.00" .................... 2.25"

Fan ..................... 4-Blade .................. 7-Blade
Diameter ............. 17" ........................ 18"
 
fratzog lover said:
I'm seeing more than 5 hp with the 68 model year improvements. Just sayin...
Click to expand...

I'm seeing 'a lot'.

And that is 'not' comparing the 1967 ~ 383/325 HP to the 1968 Road Runner/Super Bee 383/335 HP either.

Current NHRA 'Stock Class' Horsepower Factors

* 1967 ~ 383/325 HP ........ 280 HP
* 1968 ~ 383/330 HP ........ 295 HP

Those numbers look pretty close to correct and true Factory Horsepower.
 
fratzog lover said:
I'm seeing more than 5 hp with the 68 model year improvements. Just sayin...
Click to expand...

On paper, it is clear.

A 1968 ~ 383/330 HP {non Road Runner/Super Bee} would walk all over a
1967 383/325 HP.

And they did !!!

Shipping Weights

Model ....................................1968 .................. 1967
Belvedere 2-Door Sedan ......... #3419 lbs. ......... #3460 lbs.
Belvedere 'II' Hardtop ............. N/A .................. #3484 lbs.
Belvedere 'II" Convertible ........ N/A .................. #3556 lbs.
Satellite 'Hardtop' .................. #3445 lbs. ......... #3534 lbs.
Satellite 'Convertible'............... #3515 lbs. ........ #3606 lbs.
Sport Satellite 'Hardtop' .......... #3495 lbs. ......... N/A
Sport Satellite 'Convertible' ..... #3585 lbs. ......... N/A

Model ................................... 1968 ................. 1967
Coronet Deluxe 2-Door Sedan .. #3437 lbs. ........ #3478 lbs.
Coronet 440 'Hardtop' ............. #3456 lbs. ........ #3497 lbs.
Coronet 440 'Convertible' ......... N/A ................. #3588 lbs.
Coronet 500 'Hardtop' ............. #3478 lbs. ........ #3572 lbs.
Coronet 500 'Convertible' ........ #3594 lbs. ........ #3647 lbs.
 
Dave,

Back-in-the-Day,

There were more 1966 and 1967 {383/325 HP} B-Body cars around back then
as compared to the 1968 and 1969 {383/330 HP} B-Body cars.

Especially at the Track.

Also, the 1968 and 1969 Dodge Charger {383/330 HP} did not come thru with
the 383/335 HP Engine.

I'll post the 1968 NHRA Classes for both years in the next post.
 
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