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The 1973–1974 L82 was a "performance" version of the 350 that still used the casting number 624 76cc chamber "2.02" heads but with a Rochester Quadra-jet 4bbl carburetor and dual-plane aluminum intake manifold, the earlier L46 350 hp (261 kW) 350 hydraulic-lifter cam, and 9.0:1 compression forged-aluminum pistons producing 250 hp (186 kW ...
These were wedge-head engines with a unique combustion chamber that resulted from a valve angle of only 6°. This was much flatter than the 23° of the small-block Chevrolet and 20° of the Ford small-block wedge heads. This very open and flat chamber was fuel efficient and had lower than average emissions output.
For 1977, the W72 shared the same air cleaner and shared the same 500577 cast block as the L78, but received the 6x4 heads, whereas the L78 only received the lower compression 6x8 heads. The 6x4 heads were used on early Pontiac 350 blocks that helped increase the compression and also had hardened valve seats for a higher RPM operating range. [40]
The LT-1 is a Chevrolet small-block engine produced by the Chevrolet division of General Motors between 1970 and 1972. It was available exclusively in the Corvette and Camaro and was produced in relatively small quantities. It is regarded today as one of the greatest of the Chevrolet small-blocks, an engine that has been in production since 1955.
Ford offered "comfort weave" vinyl inserts on the bucket seats for the last time in 1972. An optional 6-way power bench seat, replaced the 4-way seat offered in 1971. The base engine was the 250 cu in (4.1 L) inline-six in all models except the Gran Torino Squire station wagon and the Gran Torino Sport which used the 302-2V small-block V8.
The W-series was a physically massive engine when compared to the "small-block" Chevrolet engine. It had a dry weight of approximately 665 pounds (302 kg), depending on the type of intake manifold and carburetion systems present. It was 1.5 inches longer, 2.6 inches wider, and 0.84 inches shorter than the 283 "small-block". [13]