'1967' 440/375 HP and 440/350 HP Comparison

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69 Cuda 440

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The 1967 Big Ole' "440"

'1967' ~ 440/375 HP

Found in the > Plymouth GTX, Dodge Coronet R/T and Dodge Charger R/T

* 375 Horsepower @ 4600 RPM's
* 480 Ft/Lbs. of Torque @ 3200 RPMs.

Compression Ratio ....... 10.1-1 {Flat Top Pistons}

Engine Internals
* Forged Steel Crankshaft
* Drop Forged Steel Connecting-Rods
* Cast Pistons
* Pressed-Fit Pins {High Manganese Steel}
* Dynamic Balanced
* Top Piston Ring {Cast Iron} Radius-Faced
* 2nd Ring {Cast Iron} 'Tin-Coated Edge' {Gap .013 to .022"}
* Oil Expansion Ring {Stainless-Steel}
* Bi-Metal Bearings {Main and Connecting-Rods}
* Main Bearings {Oil-Grooved Upper-Half Shell}
* Oil Pan Windage Tray
* High Pressure Oil Pump {45 to 65 lbs.} @ 2000 RPM's
* Camshaft Gear {Nylon-coated Aluminum}


Cylinder Heads ....... #2780915
Intake Valve ............... 2.08"
Exhaust Valve ............. 1.74" > {Low-Friction Valve Locks}
Combustion Chamber ... 'Closed'
CC's ........................... 78.5 {Factory} ~ 73.5 {Minimum}

Camshaft "Hydraulic'
Lift ......... .450"/.458"
Duration .. 268*/284*
Overlap .... 46*

Valve Springs 'Single-Coil' w/Surge Damper
Load-Rate ...... #129 lbs. @ 1.86"
Load-Rate ...... #258 lbs. @ 1.40"

Intake Manifold ...... #2807618 > Cast-Iron Dual-Plane Medium-Rise

Carburetor
Carter AFB {750 CFM} 'Mechanical Secondaries'
#4326S {M/T} ........ Primary Jets = .098" ~ Secondary Jets = {L}.080"/{R}.065"
#4327S {A/T} ........ Primary Jets = .098" ~ Secondary Jets = {L}.077"/{R}.065"
Primary ............ 1 11/16" {1.686"} ~ Venturi = 1.437"
Secondary ........ 1 11/16" {1.686"} ~ Venturi = 1.563"
Metering-Rods .... '3-Stage' Step-up Rods

Fuel Pump
High Pressure .. 3.5 to 5.0 lbs.

Air Cleaner
'Twin-Snorkel Scoop'

Exhaust Manifolds
Style > Swept-Design 'low-restriction'
Profile > Medium-Length Header type
Header Outlet Size > 2.38"
Driver-Side ....... #2806900
Passenger-Side .. #2806974

Exhaust Pipe Size
* Primary ....... 2 1/2" {2.50"}
* Tail Pipe ...... 2 1/4" {2.25"}

Exhaust System
* Dual
* Muffler 'Reverse-Flow'
* 'H-Pipe' Balance Cross-Over

Electrical and Ignition
* 70-Amp Battery
* 37-Amp Alternator
* High-Torque Starter
* Dual-Breaker Distributor
* Ventilated Distributor-Points

Tire Sizes
7.75 x 14"

Engine Names
* Plymouth GTX > 'Super Commando 440'
* Dodge Coronet R/T > '440 High Performance'
* Dodge Charger R/T > '440 Magnum'
 
'1967' ~ 440/350 HP

Plymouth Cars

Was found only in the Plymouth Fury 'Station Wagons'
* Fury 'I' {2-Seat}
* Fury 'II' {2-Seat and 3-Seat}
* Fury 'III" {2-Seat and 3-Seat}

* 350 Horsepower @ 4400 RPM's
* 480 Ft/Lbs. of Torque @ 2800 RPM's

Compression Ratio ...... 10.1-1 {Flat Top Pistons}

Cylinder Heads ...... #2780915
Intake Valve ............... 2.08"
Exhaust Valve ............. 1.60"
Combustion Chamber ... 'Closed'
CC's ........................... 78.5 CC {Factory} ~ 73.5 CC {Minimum}

Camshaft 'Hydraulic'
Lift ........................... .425"/.437"
Duration .................... 256*/260*
Overlap ...................... 32*

Valve Springs 'Single-Coil'
Load-Rate .......... #134 lbs. @ 1.86"
Load-Rate .......... #208 lbs. @ 1.43"

Intake Manifold ....... #2807618 > Cast-Iron Dual-Plane Medium-Rise

Carburetor
Holley #4160 Series ~ 585 CFM 'Vacuum Secondaries'
#3575 {M/T}
#3667 {A/T}
Primary ........ 1 9/16" {1.563"} ~ Venturi = 1.250"
Secondary .... 1 9/16" {1.563"} ~ Venturi = 1.313"
Primary Jets ..................... .065"
Secondary Metering Plate ... .070" Main Hole ~ .026" Idle Hole
Discharge Nozzle ............... .025"
Power Valve ....................... 6.5

Air Cleaner
'Twin-Snorkel Scoop'

Exhaust Manifolds
Style > Branch-type
Profile > Medium-Length Header, w/180* Angled-Downward Outlet
Header Outlet Size ... 2.25"
Driver Side ......... #2532464
Passenger Side ... #2461307

Exhaust Pipe Size
* Primary ...... 2 1/4" {2.25"}
* Tail Pipe ..... 2 1/4" {2.25"}

Exhaust System
* Dual
* Muffler 'Reverse-Flow'

Tire Sizes
8.55 x 14"

Engine Name
'Commando 440'
 
The 440/375 combination never really got it's just due,for how complete the whole combination (drivetrain,engine,& chassis) it was. Nothing like ordering a 396 or 350 Camaro or Chevelle with 3.08 gears & a two speed Powerglide. ( low line Chevs,could really be turds...)
 
Paul, a stupid question if you don't mind? Not trying to throw you off track.....but I think this kinda fits in.

You said the 375 HP 440 had 10:1 compression......and I am sure that's rated correctly. Does that mean they used the "Six Pack" piston or did they get the compression from the 67 only closed chamber heads with the "standard" 440 piston? Thank you drive through.

Oh and awesome info as usual.
 
RustyRatRod said:
Paul, a stupid question if you don't mind? Not trying to throw you off track.....but I think this kinda fits in.

You said the 375 HP 440 had 10:1 compression......and I am sure that's rated correctly. Does that mean they used the "Six Pack" piston or did they get the compression from the 67 only closed chamber heads with the "standard" 440 piston? Thank you drive through.

Oh and awesome info as usual.
Click to expand...

Ah, good question.

The 1967 '440' came thru with 10.1-1 Compression, with Flat-Top Pistons.
* Deck Clearance ..... {-.059"} down in the bore.
* Head Gasket ...........{.021"}

The 1967 '440 HP' Cylinder Heads {#2780915} were Closed-Chamber, and came from the
factory at {78 to 80 CC's}. 'NHRA' Minimum CC-level was 73.5
-----------------------------------------------------------------------------------------------------

The 1968 and 1969 '440' also came thru with 10.1-1 Compression, with Flat-Top Pistons.
* Deck Clearance ....... {-.027"} down in the bore.
* Head Gasket ........... {.020"}

The 1968 and 1969 '383 and 440' Cylinder Heads {#2843906} were Open-Chamber, and came
from the factory at {85 to 87 CC's}. 'NHRA' minimum CC-level was 79.5

End Result

Both '440/375 HP' engines had the same compression.

The 1967 '440' had {6.0} less CC's in the Cylinder Head Combustion Chamber, but the
Flat-Top Pistons were {-.032} further down in the Cylinder Bore than the
1968 and 1969 '440' engine.

In '1970'

The Piston Height/Depth was changed.
 
'1967' ~ 440/350 HP

Chrysler Cars

New Yorker

The {440/350 HP} was the standard engine for the Chrysler New Yorker.
* Single Exhaust Pipe System

Available > 2-Door Hardtop ~ 4-Door Hardtop ~ 4-Door Sedan

Standard Rear-End Gears .... 2.76

Tires > 8.55 x 14"
Chrome Road Wheels > 14" x 5.5" {Optional}

The '440 TNT" {440/375 HP} was available as an option on the New Yorker.
* Twin-Snorkel Scoop Air-Cleaner
* Dual Exhaust {2 1/2" Primary Pipes ~ 2" Tail-Pipes}
* Chrome Valve Covers
* Standard Rear-End Gears .... 3.23 {w/Sure-Grip}
* Tires > 8.45 x 15"
* Tires {Optional > 8.85 x 15"}

Shipping Weights
* 2-Door Hardtop ......... #4210 lbs.
* 4-Door Hardtop ......... #4280 lbs.
* 4-Door Sedan ........... #4225 lbs.
 
my dad had a new 67 chrysler 300 with the 350 horse power.. it was turquoise i think. and had the holly carb. that gave nothing but trouble. my stock 413 65 300 L would walk all over his.
 
moe7404 said:
my dad had a new 67 chrysler 300 with the 350 horse power.. it was turquoise i think. and had the holly carb. that gave nothing but trouble. my stock 413 65 300 L would walk all over his.
Click to expand...

Yes,

Those 1967 Chrysler Boats could be as slow as a Freight Train pulling out of
a Railroad Yard.

Especially the 440/350 HP with the Single-Exhaust and 2.76 Gears, and 8.55 x 14" Tires.

A very slow rotation.

But, once those 'Boats' got up to 90 MPH, they were frightening coming up behind
you on the Parkway or Thruway.

Curb Weight with 2-People ........ #4700 lbs. 'plus'
 
you are so right. but my 413 65 300 L 3,23 gear stock 4200 lbs cut a 16.00 1/4 i could walk all over any cadie
 
moe7404 said:
you are so right. but my 413 65 300 L 3,23 gear stock 4200 lbs cut a 16.00 1/4 i could walk all over any cadie
Click to expand...

Moe 7404,

I had to take a look.

The 1965 Chrysler 300 'L' .......... 'one sharped dressed man'

* 413/360 HP
* 360 Horsepower @ 4800 RPM's
* 470 Ft/Lbs. of Torque @ 3200 RPM's
* 10.0-1 Compression Ratio
* #516 Cylinder Heads {2.08" Intake ~ 1.60" Exhaust}
* Dual Exhaust
* Dual-Point Distributor
* Carter AFB #3860S {1 7/16" x 1 9/16"} ~ 575 CFM's
* Camshaft ........ .431"/.431" Lift ~ 268*/268* Duration ~ 48* Overlap

Only '2845' produced.

And ........ '108' with a 4-Speed.
 
Thank you kind sir.


69 Cuda 440 said:
Ah, good question.

The 1967 '440' came thru with 10.1-1 Compression, with Flat-Top Pistons.
* Deck Clearance ..... {-.059"} down in the bore.
* Head Gasket ...........{.021"}

The 1967 '440 HP' Cylinder Heads {#2780915} were Closed-Chamber, and came from the
factory at {78 to 80 CC's}. 'NHRA' Minimum CC-level was 73.5
-----------------------------------------------------------------------------------------------------

The 1968 and 1969 '440' also came thru with 10.1-1 Compression, with Flat-Top Pistons.
* Deck Clearance ....... {-.027"} down in the bore.
* Head Gasket ........... {.020"}

The 1968 and 1969 '383 and 440' Cylinder Heads {#2843906} were Open-Chamber, and came
from the factory at {85 to 87 CC's}. 'NHRA' minimum CC-level was 79.5

End Result

Both '440/375 HP' engines had the same compression.

The 1967 '440' had {6.0} less CC's in the Cylinder Head Combustion Chamber, but the
Flat-Top Pistons were {-.032} further down in the Cylinder Bore than the
1968 and 1969 '440' engine.

In '1970'

The Piston Height/Depth was changed.
Click to expand...
 
Good read. Thanks for posting.
 
What do you think the C.R. would be on a 69 375 hp version if you took 0.030 off of the
heads? (cause that's what we did back in the day)
 
Old Man Mopar said:
What do you think the C.R. would be on a 69 375 hp version if you took 0.030 off of the
heads? (cause that's what we did back in the day)
Click to expand...

According to Dick Maxwell

A '1969' 440/375 HP with a properly decked block to {NHRA Specs}
Piston Depth > {-.027"}

And with the #2843906 Cylinder Heads CC'd to {79.5}.

The 'net' Compression Ratio would be ............ 10.79 - 1
-------------------------------------------------------------------------------

Milling

You have to Mill the #2843906 'Open Chamber' Cylinder Head {.0042"} per CC.

If you're 'Milling {.030"}, you will reduce the Combustion Chamber by {7.1 CC's}.

On a 'Mopar 440' > 1 CC = .11 Gain in Compression.

Equation ...... 7.1 CC's x .11 = .781 in Compression Gain
 
The 915 heads are a nice upgrade over 906. Had them on a 383 hp more torque and hp and still run pump 93 because of the quench. These were basicly stock pocket port with the small exhaust valve they CC'ed at 80.
 
My question is, my 69' 383 HP block is 10.1 0r so, and I have a new set of 915's. The piston appears to be flat top, but very close. I would like to use them on the 69'. What will it do in that application? This for my 69' 383 Cuda, stock manifolds. Sorry for a repeat question from above. My 915's have the large exhaust valve. .
 
My 68 383 had the flat tops and sat very near zero deck which is not always the case. Remember the stock gasket was like .022 but the CR was more like 9.3 to 9.6 if you really measured every thing out. My 383 was 9.2 with the 906 and .039 felpros the 915 took it to 10.0.
 
oldmopardude said:
it sounds tight with the HP pistons. any suggestions?
Click to expand...

What do you mean tight? If your pistons are at zero and even with the top of the deck the felpro better HP gasket will be about .039 compressed which is perfect quench!! I wish mopar just used the 915 chamber instead of the poor open chamber design.
 
EL5DEMON340 said:
What do you mean tight? If your pistons are at zero and even with the top of the deck the felpro better HP gasket will be about .039 compressed which is perfect quench!! I wish mopar just used the 915 chamber instead of the poor open chamber design.
Click to expand...

El Correcto >

You have to be careful with the 1968 and later 383 Engines, when swapping over
to the #2780915 {1967 440 HP} 'Closed Chamber' Cylinder Heads.

Always use a 'thicker' Head Gasket.

Fel-Pro #8519-PT1
* Perma-Torque
* .039" Compressed Thickness
* Bore Opening 4.500"

Mr. Gasket #3217G
* Multi-Layered Steel Gasket
* .040" Compressed Thickness
* Bore Opening 4.380"
 
the 65 300 L cam was not real big. but got 20 more horse than the new yourker 413. but same MPG. and very streetable. start easy , did not eat spark plugs. the champion j10y plugs was a tad lean. but raiseing float level to 5/16 fixed the trouble.
 
moe7404 said:
the 65 300 L cam was not real big. but got 20 more horse than the new yourker 413. but same MPG. and very streetable. start easy , did not eat spark plugs. the champion j10y plugs was a tad lean. but raiseing float level to 5/16 fixed the trouble.
Click to expand...

1967 Chrysler 'New Yorker'

Big draw back with the 440/350 HP.

Came thru with 'Single-Exhaust' and 2.76 Gears.

So sloooooooow when taking off.
 
'1967' ~ 440/350 HP

Chrysler Cars

'Newport'

The standard engine was the 383/270 HP ~ 2-Barrel

Available > 2-Door Hardtop ~ 4-Door Hardtop ~ 2-Door Convertible ~ 4-Door Sedan

And the standard Transmission was a 'column-shifted' 3-Speed Manual.

Base Tires ....... 8.25 x 14"

Gears ............. 2.76

Drum Brakes {Standard Equipment}
* Front ...... 11" x 2.75"
* Rear ....... 11" x 2.50"

The 'Firepower 440' {440/350 HP} was available as an option with >
* Single Snorkel Air Cleaner
* Single Exhaust System

* Primary Pipe ......... 2 1/2" {2.50"}
* Tail Pipe ............... 2 1/4" {2.25"}

The '440 TNT' {440/375 HP} was available as an option.
* Twin Snorkel Scoop Air-Cleaner
* Dual-Exhaust
* Power-Disc Brakes are required
* Standard Tires ......... 8.45 x 15"
* 3.23 Gears

* Optional Tires .......... 8.85 x 15"

Shipping Weight
* 2-Door Hardtop .......... #3920 lbs.
* 4-Door Hardtop .......... #3980 lbs.
* 2-Door Convertible ..... #3975 lbs.
* 4-Door Sedan ............ #3955 lbs.
 
Frito,

Regarding the '1967' 440 in the other Mopar's besides the GTX, Coronet R/T and
Charger R/T.

The 440/350 HP came thru with both a Single Exhaust Pipe System or
Dual Exhaust.

On the 'Single-Pipe System', it came thru with a 2 1/2" Primary Pipe, and
2 1/4" Secondary Pipe.

On the 'Dual-Exhaust System', they came thru with 2 1/2" Primary Pipes,
and 2" Secondary Pipes.

But, on the Station Wagons, all 440's came thru with 'standard' Dual Exhaust,
with both 2 1/4" Primary Pipes, and 2 1/4" Secondary Pipes.
 
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