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 The most reliable engine ever made- the Slant six engine from Chrysler

The slant six engine. Google slant six and you will see words such as Reliable, legendary, dependable. 
Forum boards on how to modify the slant six. Articles such as this one here, with specifications,
it's history, the makes and models the slant 6 were in.

But, if you are one of those "Googler's"  who are looking for accurate, reliable information on this engine. Would it not be wise on your part to get that information from those that have relied on the Slant 6 for their own transportation?
Those men and women that have and maybe still do, rely on, and depend on the slant six to get them from point A to B?
Slant Six.
The one to your left is the Super Slant Six engine.

My very first car was a Plymouth Duster with the Slant six engine back in the 1980's.
slant 6 engine information

Information on the Chrysler Slant Six Engine, Created in 1959 to 2000

  • The slant 6 engine came about from the Chrysler company.
  • From 1959-2000 was the years the Chrysler slant 6 engine was around.
  • The slant 6 engine displacements. 170ci (2.8L),198ci (3.2L), 225ci (3.7L)
  • The Chrysler slant 6 engine predecessor was the Flathead 6.
  • The slant 6 compression ratio was 8.2:1 - 8.5:1
  • The Chrysler slant 6 engine Fuel Type was Carbureted.
  • The slant 6 cooling system was a jacketed block, water pump to radiator.
  • The Chrysler slant 6 engine was also known as the G-engine and in parts of deep south Slick 6
  • The slant 6 was and still is, as famous as the Hemi Engine.
  • The slant 6 engine was slanted at a 30-degree angle.
  • The Chrysler slant 6 cylinder block was Cast iron.
  • The slant 6 heads were Chrome Alloy Cast iron.

Chrysler's 170 cubic inch (2.8 Liter) Slant six engine

 The slant six was known for it durability and reliability.The 6 cylinder engine is inclined toward the right at an angle of 30 degrees from the vertical in the engine compartment.


This design permits a lower hood line and allows space, in the engine compartment for the long intake manifold branches. The engine has in-line overhead valves and wedge-shaped combustion chambers and a nominal compression ratio of 8.5:1 for the 170 cu. in. engine and 8.4:1 for the 225 cu. in. engine.


 The 170 cubic inch "LG" referring to the relatively short engine block casting and crankshaft stroke in the valiant.

The 198 cubic inch (3.2 liter) Slant six engine from Chrysler

The 198 cubic inch slant six was introduced in the North American market in 1970.

It was a more powerful engine than the 170 cubic inch. The increased displacement improved vehicle performance with a lower manufacturing cost.


By installing a crankshaft with 3.64 inch stroke into the tall "RG" block, also used with the 225 cubic inch version of the engine.The 198 cubic inch engine was available through the 1974 model year.


Chrysler's 225 cubic inch (3.7 Liter) Slant Six engine

The 225 cubic inch "RG" (raised -g referring to the relatively tall engine block casting and crankshaft stroke) in full-size Plymouth and dodge dart models.

Plymouth referred to the engine as the 30-d-economy six engine. Referring to the 30 degree cylinder block angle.

One of my trips to a car show had this Panther Pink Duster with the famous Slant Six Engine.
slant 6 engine information

Specifications to Chrysler's 225 cubic inch Six-cylinder engine for 1974 to 1991

 225 Cubic Inch
 Bore and Stroke .... 3.40 in x 4.125 in

Oil pump specs for Chrysler 225 cubic inch Six-cylinder Slant Six engine for 1974 to 1991

OIL PUMP COVER SURFACE VARIATION LIMIT ........................................0.0015 IN

OUTER ROTOR THICKNESS LIMIT ..................................................NOT LESS THAN 0.825 IN

OUTER ROTOR DIAMETER LIMIT .............................................NO LESS THAN 2.469 IN

INNER ROTOR THICKNESS LIMIT ................................................NO LESS THAN 0.825 INN

CLEARANCE OVER ROTORS ..................................................... NO MORE THAN 0.004 IN

OUTER ROTOR CLEARANCE LIMIT .................................................NO MORE THAN 0.014 IN

ROTOR TIP CLEARANCE LIMIT ................................................ NO MORE THAN 0.010 IN

RELIEF VALVE SPRING FREE LENGTH ........................................2.25 IN

Torque Specifications for Chrysler 225 cubic inch Six-cylinder engine for 1974 to 1991

ALTERNATOR ADJUSTING STRAP BOLT ............................................17 FOOT-POUNDS

ALTERNATOR ADJUSTING STRAP MOUNTING BOLT ..........................30 FT-LB

ALTERNATOR BRACKET BOLT ..................................................5/16 INCH ....17 FT-LB

ALTERNATOR BRACKET BOLT ................................................3/8 INCH  ...... 30 FT-LB

ALTERNATOR MOUNTING PIVOT NUT ......................................... 30 FT-LB

CAMSHAFT LOCK BOLT ....................................................... 50 FT-LB

CARBURETOR-TO-MANIFOLD NUTS .........................................17 FT-LB

CLUTCH HOUSING BOLT ................................................................3/8 INCH .... 30 FT-LB

CLUTCH HOUSING BOLT ................................................................7/16 INCH ... 50 FT-LB

CRANKSHAFT REAR BEARING SEAL RETAINER ..................................... 30 FT-LB

CYLINDER HEAD BOLT ................................................................... 70 FT-LB

DRIVEPLATE-TO-CONVERTER ................................................ 22 FT-LB

DRIVEPLATE-TO-CRANKSHAFT ...................................................... 55 FT-LB

ENGINE FRONT MOUNTING INSULATOR-TO-FRAME NUT .......................... 75 FT-LB

ENGINE FRONT MOUNTING INSULATOR -TO-ENGINE NUT ......................... 75 FT-LB

ENGINE FRONT MOUNTING INSULATOR-TO-BRACKET BOLT .................. 50 FT-LB

ENGINE REAR MOUNT INSULATOR-TO-CROSSMEMBER NUT ............... 50 FT-LB

ENGINE REAR MOUNT INSULATOR-TO-EXTENSION ................................ 50 FT-LB

ENGINE REAR MOUNT CROSSMEMBER-TO-FRAME NUT ........................... 30 FT-LB

EXHAUST PIPE FLANGE NUT .................................................................. 35 FT-LB

EXHAUST PIPE SUPPORT BOLTS ..................................................... 50 FT-LB

FAN BLADE MOUNTING BOLTS .................................................. 17 FT-LB

FLYWHEEL-TO-CRANKSHAFT ........................................................... 55 FT-LB

FUEL PUMP MOUNTING BOLT ..................................................... 30 FT-LB

INTAKE-TO-EXHAUST MANIFOLD INBOARD STUD NUT .................................. 30 FT-LB

INTAKE-TO-EXHAUST MANIFOLD OUTBOARD BOLTS .................................... 20 FT-LB

MANIFOLD ASSEMBLY NUTS ....................................................... 120 INCH - LB

OIL PAN DRAIN PLUG ............................................................ 20 FT-LB

OIL PAN BOLTS ................................................................... 17 FT-LB

OIL PUMP COVER BOLTS ....................................................... 130 INCH - LB

OIL PUMP MOUNTING BOLTS .................................................... 200 INCH-LB

ROCKER ARM COVER BOLTS ................................................... 95 INCH-LB

ROCKER SHAFT BRACKET BOLT ............................................... 25 FT-LB

STARTER MOUNTING BOLT .................................................... 50 FT-LB

TIMING CHAIN COVER BOLTS ..................................................... 2OO INCH-LB

WATER PUMP-TO-HOUSING BOLT ................................................ 30 FT-LB

 

Tightening Sequence for Chrysler's 170-198-and 225 cubic inch Slant 6 engine's

The 6 cylinder engine is inclined toward the right at an angle of 30 degrees from the vertical in the engine compartment. This design permits a lower hood line and allows space in the engine compartment for the long intake manifold branches. The engine has in-line overhead valves and wedge-shaped combustion chambers and a nominal compression ratio of 8.5:1 for the 170 cu. in. engine and 8.4:1 for the 225 cu. in. engine.


The lubrication system consists of an externally mounted rotor type pump on the lower right side of the cylinder block.

A full flow replaceable element type oil filter is mounted on the rear of the oil pump body.

Oil is forced by the oil pump to a series of oil passages in the slant six engine.


The semi-series flow cooling system contains an aluminum water pump body with a pressed in ball bearing and seal assembly and plastic impeller. The water pump housing is integral with the cylinder block.

The slant six engine was one of the most reliable engine's to come from the Chrysler Corporation.


My take on the Slant Six Engine-- Article by: James Frampton - 08-2014

I felt I needed to add my comments to this page on the Slant Six Engine. Why?
Well, the five years this information has been here, I have received many E-mails questioning me on how could I title the slant six on being the "Most reliable engine ever made"

Well, let me say first, maybe I should have written "One of the Most reliable engine ever made".

Obviously, today's engines are more efficient than those of yesterday.  
Better fuel mileage. Less maintenance.
Fuel injection compared to carbureted one's.
And there are other things that might make the slant six look like a dinosaur.

BUT, yep I said but. My first car was a Duster with a slant six sitting in the engine bay.
The Duster had over 200,000 miles on it.
Maybe the body was a little rough. The interior had seen its better days. BUT,
That slant six engine purred like a kitten.
I could always count on that car to get me to school and my job.

While most of my peers were driving Mustangs, Camaros & other "cool" looking cars, I had this beat up Duster.
Not ever knowing I had a cool looking car myself.
But at that time, (( well over 30 years ago)) I just wasn't aware of it-LOL

My second car, a Dodge Dart. It also had a slant 6 engine.
Now, this Dart was beat to hell & back.
Interior was wasted.

And when a buddy of mine, who rode to and from work with me.
Would have to "crank" the windshield wiper arm, just under the dash.
He would have to pull & push this arm any and every time it rained. NO headliner, door panels? What door panels.
No air conditioner, No radio. ((It did have the original paint."

Close to 270,000 miles on the engine. I could always trust that car to get me from point A to B.
I have owned many others with the slant six.
Like the 1986 Dodge. Terrible exhaust leak, but that slant six would run like a top.

That ladies & gentlemen is why I Titled the above article, "The most reliable engine ever made". OK?