Chrysler Slant-6 engine

Chrysler Slant Six (G, RG) engine
"Super 225" in a 1965 Plymouth Barracuda
Overview
Manufacturer	Chrysler Corporation
Production	1959–2000
Combustion chamber
Configuration	I6
Displacement	170 cu in (2.8 L) 198 cu in (3.2 L) 225 cu in (3.7 L)
Cylinder block alloy	Cast iron Aluminum
Cylinder head alloy	Cast iron
Valvetrain	OHV
Compression ratio	8.2:1 - 8.5:1 (nominal)
Combustion
Fuel system	Carbureted
Fuel type	Gasoline
Oil system	Full pressure w/full-flow filter & gerotor oil pump
Cooling system	Jacketed block, Water pump to radiator
Chronology
Predecessor	Flathead 6
Successor	239/3.9 V6

The Slant-6 is a Chrysler automobile engine, known within Chrysler as the G-engine. Introduced in 1959, the Slant-6 is an inline-6 internal combustion piston engine with the cylinder bank inclined at a 30-degree angle from vertical.

The Chrysler Slant-6 engine was a clean-sheet design, led by Willem Weertman, later Chrysler's chief engine designer. Its characteristic 30° inclination of cylinder block gives it a lower height overall engine package. This enabled vehicle stylists to lower hoodlines, and also made room for the water pump to be mounted with a lateral offset, significantly shortening the engine's overall length. The slanted cylinder block also provides space in the vehicle's engine bay for intake and exhaust manifolds with runners of longer and more nearly equal length compared to the rake- or log-style manifolds typical of other inline engines. The Slant-6 manifold configuration gives relatively even distribution of fuel mixture to all cylinders, and presents less flow restriction. This, in turn, provides for relatively good airflow through the engine despite the intake and exhaust ports being on the same side of the head rather than in a crossflow arrangement.

It was introduced in two piston displacement sizes in 1960: The 170-cubic-inch (2.8-litre) "LG" (Low-G, referring to the relatively short engine block casting and crankshaft stroke) in the Valiant, and the 225-cubic-inch (3.7-litre) "RG" (Raised-G, referring to the relatively tall engine block casting and crankshaft stroke) in full-size Plymouth and Dodge Dart models. In 1960, the engine was called the "30-D Economy Six" engine by Plymouth marketers, referring to the 30° cylinder block angle.

The G-engine was offered in various configurations in the North American market until 1983 in cars, 1987 in trucks, and 1991 for marine, agricultural, and industrial use. Replacement engines were built in Mexico through 2000. The G-engine was used by Chrysler's international operations in locally produced vehicles. It was also purchased by other original equipment manufacturers for installation in commercial vehicles, agricultural and industrial equipment, and boats.