1970 Plymouth Road Runner. Scott Ross
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Название: 1970 Plymouth Road Runner
Автор: Scott Ross
Издательство: Ingram
Жанр: Автомобили и ПДД
isbn: 9781613254592
isbn:
For many performance-car buyers, that was plenty. For others, the optional 440 Six Barrel offered more in the way of features and performance. Using the 440 Magnum as a base, the 440 Six Barrel used the same new-for-1970 thicker forged-steel connecting rods, molybdenum-filled top piston rings, and revised camshaft lift and duration that the 440 Magnum used, along with the 906 cylinder heads (so nicknamed from the last three digits of its factory casting number), which flanked a new intake manifold that was topped by three big Holley 2-barrel carburetors with mechanical linkage.
The new intake manifold was cast iron, instead of the cast-aluminum part sourced from aftermarket specialty company Edelbrock for 1969. Cost issues (namely involving the much-lower cost of cast iron compared to cast aluminum) and concerns that Edelbrock’s foundry didn’t have the capacity to support this option over a full model year led Chrysler to take it in-house for 1970. (Some early 1970 440 Six Barrels were built with leftover 1969 aluminum intake manifolds to use up the parts stock on hand.)
Using the simulated scoops pressed into the 1970 Road Runner’s rear quarter panels, the optional Dust Trail side stripes extended forward to the decal of the running bird on the front fender. The stripe appears to be dusty brown until light shines on it, which then reveals the stripe’s reflective gold-colored material. (Photo Courtesy David Newhardt)
Add a slight bump in compression from 10.1 to 10.5:1 (meaning that the best available pump premium gasoline was your only fuel choice, lest your engine “knock” from lack of octane and tear itself apart inside) and the 440 Six Barrel was good for a peak of 390 hp and 490 ft-lbs of torque. It was a great performance value if you look at how much extra it cost, compared to the 426 Hemi.
The horsepower and torque numbers for the 440 Six Barrel were reached at lower engine speeds than the Hemi’s, adding to the dual street/strip capability of the triple-carbed RB engine.
The 426 Hemi was Plymouth’s top performer since its 1-2-3 finish in its debut at the 1964 Daytona 500, and being put on the B-Body Plymouth option list in 1966. For 1970, its camshaft was switched from a solid-lifter one to a hydraulic-lifter stick, while not losing any performance as evidenced by its 425-hp rating, the same as for 1969.
The voice of the Road Runner was the “Beep Beep!” horn that simulated the cartoon bird’s voice. The purple color helped assembly-line workers tell it apart from the regular horns used on other B-Body Plymouths. The 1970 sticker still said “Warner Bros. – Seven Arts, Inc.” on it, even though a 1969 studio-ownership change had shortened the name back to Warner Bros.
The 1970 Road Runner convertible shows the same vertical-pattern grille that was used on the base Belvedere and Satellite series in 1970. Also seen here is the grille’s “dog bone” shape that the 1971 B-Body Plymouths wore. (Photo Courtesy David Newhardt)
The 426 Hemi resided at the top of the Road Runner’s engine list and was conservatively rated at 425 hp. It carried the Bird to 60 mph in just 5.6 seconds, running the quarter-mile in 13.49 seconds.
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