Editing Chrysler Slant-6 engine (section)

==Design==
The Chrysler Slant Six engine was a clean-sheet design, led by [[Willem Weertman]], later Chrysler's chief engine designer.<ref name="Weertman_Allpar">{{cite web|url=http://www.allpar.com/corporate/bios/weertman.html |title=Willem Weertman - Chrysler Chief Engineer, Engine Design and Development |publisher=Allpar.com |access-date=10 December 2015}}</ref> Its characteristic 30° inclined cylinder block gave it a lower height, copying the same cant Mercedes-Benz had introduced in 1952 in its [[Mercedes-Benz M186 engine|M186]]-engined [[300SL]] sports car. This enabled Chrysler stylists to lower hood lines, 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 No. 1 and No. 6 intake runners are of approximately equal length, the No. 2 and No. 5 equal but shorter, and the No. 3 and No. 4 equal and shortest. This has the effect of broadening the torque curve for better performance.{{cn|date=February 2025}} The Slant Six 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 cylinder head|crossflow]] arrangement.<ref name="Allpar_Slant">{{cite web|url= http://www.allpar.com/slant6.html |title=The Chrysler Slant Six Engine (170-198-225) |work=allpar.com |access-date=10 December 2015}}</ref>

It was introduced in two [[Engine displacement|displacements]] in 1960: The {{cvt|170|cuin|L|1|adj=on}} "LG" (low-G, referring to the relatively short [[engine block]] casting and [[crankshaft]] stroke) in the compact [[Plymouth_Valiant#First_generation_(1960–1962)|Valiant]], and the {{cvt|225|cuin|L|1|adj=on}} "RG" (raised-G, referring to the relatively tall engine block casting and crankshaft stroke) in full-size [[Plymouth (automobile)|Plymouth]] and [[Dodge Dart]] models. In 1960, the engine was called the "30-D Economy Six" engine by Plymouth marketers,<ref>{{cite web|last=Knutson |first=Lanny |url=http://www.allpar.com/history/plymouth/1960.html |title=1960 Plymouth Cars: Fins' Final Fling |publisher=allpar.com |access-date=10 December 2015}}</ref><ref>{{cite magazine|url= https://books.google.com/books?id=JVUEAAAAMBAJ&pg=PA66 |page=66 |magazine=Life |title=Solid for '60... (Plymouth advertisement) |date=19 October 1959 |volume=47 |issue=16 |access-date=10 December 2015}}</ref> 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.

{{Listen
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The G-engine gained a reputation for reliability and durability. The basic design is rigid and sturdy, in part because the engine was designed to be made of either iron or aluminum. An aluminum block was produced in 1961–1963, but most blocks were made of iron.<ref name=Allpar_Slant/> The block is of a deep-skirt design, with the crankshaft axis well above the oil pan rails for structural rigidity. Although only four [[main bearing]]s are used, they are of the same dimensions as those in the 2G 5-bearing (1964–1971) Hemi, and fewer mains results in a crankshaft better able to withstand the effects of torque.{{cn|date=February 2025}} Efficient cooling and lubrication systems, a favorable ratio of [[connecting rod]] length to stroke, and a [[forged steel]] crankshaft (on engines made through mid-1976) all contributed to the engine's strength and durability.

The G-engine was designed for utility and economy, and gave better overall performance than its competitors at its 1960 introduction.{{cn|date=February 2025}} It generally kept up through the 1960s and early-1970s with its direct competition,{{cn|date=February 2025}} though specialty 6-cylinder engines like the [[Pontiac Straight-6 engine#Overhead Cam|Pontiac OHC Six]], a brief GM outlier designed for its sporty [[Pontiac_Firebird#First_generation_(1967–1969)|Firebird]] [[pony car]], bested the performance of most versions of the Slant-6. After an early factory racing program was discontinued by 1962, the Slant Six did not receive much performance development. Most Slant Sixes were equipped with a single 1-barrel [[carburetor]]. Starting in the early 1970s, primitive [[Vehicle emissions control|emission controls]] adversely affected driveability and power, though a version of the 2-barrel carburetor package first released for marine and export markets in 1967 was offered in North America from 1977 to 1983 under the "Super Six" name. Performance figures were only slightly higher, but driveability was substantially improved.<ref name="Hagenbuch_Allpar">{{cite web|url=http://www.allpar.com/corporate/bios/hagenbuch-interview.html |title=Interview with Pete Hagenbuch, Chrysler engine development engineer |publisher=allpar.com |access-date=10 December 2015}}</ref>

Other Chrysler engines were released with more advanced [[combustion chamber]]s, electronic fuel injection, and other modern improvements, but the length of the Slant Six precluded its use in Chrysler's front-wheel-drive cars. A new {{cvt|3.9|L|cuin|0}} [[V6 engine]] was created for the 1987 [[Dodge Dakota]] compact pickup truck by removing two cylinders from the corporate {{cvt|318|cuin|L|1|adj=on}} [[Chrysler LA engine|LA V8 engine]]. It replaced the Slant-6 in the rest of the Dodge truck line at the end of the 1987 model year.<ref name=Allpar_Slant/>