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Its design shared much with the L29 454, but with the addition of forged pistons and crankshaft, and coil near plug ignition. It had slightly reduced power compared to the L29 454 and used a different PCM. The L21 was paired with the early 4-speed Allison automatic transmission or manual transmission, depending on the application. L21 applications:
It was released one year earlier than the tall deck 425, and debuted the standard 3.385 in (86.0 mm) stroke; bore was 3.938 in (100.0 mm). 330s were painted gold and had forged steel crankshafts. The 4-barrel versions had a larger diameter harmonic damper, the 2 barrel only a balancer hub without the rubberized outer ring.
The cylinder block remained basically the same. It was still a V-shaped, 90-degree design made of cast iron. The crankshaft, located to the bottom of the block by five main bearing caps, was cast steel, and the eight connecting rods were forged steel. The pistons were cast aluminum, with a hypereutectic design. [8]
This allowed the use of cast-iron crankshafts; the previous crankshafts were made of forged steel, which was more expensive. The rod bolts were changed from 11/32" diameter to 3/8". The oil-fill location was moved from a tube on the front of the intake manifold to a cap on the left- or right-side valve cover, depending upon the application.
In 1976 it was rated at 215 hp (218 PS; 160 kW). Like the 390, the 401's crankshaft and connecting rods are forged steel. It was last produced in 1978. The 401 was available in the Javelin, Matador, and Ambassador car lines and in Jeeps from its introduction in 1971 through 1974.
While the iron block and forged steel crankshaft were sourced directly from the InTech 5.4 L, the Cobra R powerplant benefited from new, high-flow cylinder heads that were designed with features developed for Ford's "Rough Rider" off-road racing program, application specific camshafts with higher lift and more duration than other 4-valve ...
Design features of the B and RB engines include 17 capscrews per cylinder head, a cylinder block that extends 3 in (76.2 mm) below the crankshaft centerline, an intake manifold not exposed to crankcase oil on the underside, stamped-steel shaft-mounted rocker arms (race versions used forged steel rockers), and a front-mounted external oil pump driven by the camshaft.
This engine used a forged steel crankshaft with three main bearings and cast-iron pistons. Bore and stroke were 3 + 5 ⁄ 16 in × 3 + 3 ⁄ 4 in (84 mm × 95 mm). A balanced crankshaft was introduced for 1932, while a higher (5.2:1) compression ratio increased output to 60 hp (45 kW).
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