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The Iron Duke is often confused with Chevrolet's Stovebolt -derived '' 153 '' from the 1960s Chevy II , but the engines are entirely different - the Iron Duke's intake manifold is on the passenger side, as opposed to the driver side. One thing that both share is the Chevrolet Small-Block bellhousing bolt pattern. Applications:
LS6 The LS6 was a 151 in³ (2.5 L) I4 engine produced from 1978 to 1979 . LS8 The LS8 was a 151 in³ (2.5 L) I4 engine produced from 1979 to 1979 . LX6 The LX6 was a 151 in³ (2.5 L) I4 engine produced from 1977 to 1978 . LX8 The LX8 was a 151 in³ (2.5 L) I4 engine produced from 1979 to 1980 . CROSSFLOW Cross-flow cylinder heads were added in 1980 , leading people to refer to this version as the crossflow. Output stood at 90 hp (67 kW). AMC/JEEP Several American Motors models used the Iron Duke from 1980 to 1983 , before AMC had finished its own 2.5 L I4 . Output was 82 hp (61 kW). Applications: TECH IV Iron Dukes were fitted with Fuel Injection (via a single injector in the throttle body) in 1982 . This version was christened the Tech IV, though '' Car And Driver '' later ridiculed it as the ''low''-Tech IV. Power output remained at 90 hp (67 kW). This was replaced by a swirl-port head with 9.0:1 (instead of 8.2:1) compression ratio in 1984 for a 2 hp (1.5 kW) gain. Other additions for 1985 included roller lifters, improved bearings, and a new crankshaft. A more-modern serpentine belt and crank-triggered ignition was added in 1987 . The engine was updated one final time the next year with Balance Shaft s, new pistons, rods, crankshaft, and an in-pan oiling system. This 1988 Tech IV produced 98 hp (73 kW). The Tech IV uses the same bellhousing pattern as the 2.8 L '' 60-Degree '' V6. Applications:
RACING VERSIONS Though not a production engine, the Super Duty 4 racing engine was notable and widely publicized at the time. It was the basis for NASCAR 's Touring Car series. Cosworth also produced a 16-valve head for the Iron Duke. SEE ALSO |
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