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Since 1972 Chrysler had not offered a 6 cylinder with sports aspiration but that would change with the release of the Dodge Polara RT, it was a hard top coupe equipped with the new high-performance Slant Six RG 225 or commonly known as Slant Six RT, thanks to the addition of a new Holley 2300 two-barrel carburetor, "3a1" exhaust manifolds, a ...
Chrysler Australia wanted a new six-cylinder engine for use in the Australian Chrysler Valiant, and so Chrysler USA sent a prototype engine to Chrysler Australia's engineers to continue developing the D-engine. The first 245 cu in (4.0 L) variant was released for the 1970 model year in the VG-model Valiant.
It differed from the US Plymouth Valiant in having a six-bar grille, [5] a larger boot with a different rear deck and a flat rear window. [4] The 225 cid slant six engine was carried over from the SV1 model and remained fully imported. [4] Suspension was substantially unchanged but employed softer rear springs. [4]
Also notable was the Valiant's performance with 145 brake horsepower (108 kW) from the 225 Slant-6 engine. This was a lot of power compared to the competing Holdens and Fords, which offered only 75 bhp (56 kW) and 90 bhp (67 kW) SAE respectively.
In 1976, the Valiant was available as a Code A38 police package car and offered in three basic engine sizes: E24 (California emission standards) and E25 (federal) 225 cu in (3.7 L) single-barrel slant-six; E44 318 cu in (5.2 L), twin-barrel V-8; E58 360 cu in (5.9 L), four-barrel V-8 with single (California) or dual (federal) exhaust.
The engine was fitted with Chrysler's Hyper Pak performance package. [26] A 170 cubic inch Slant-6 with Hyper Pak typically developed around 148 hp (110 kW). [27] [28] Apart from the Hyper Pak kit, the engine in the XNR is distinguished by being one of just twelve Slant-6s built to "NASCAR" specifications, which included other upgrades.