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The original 3.3 engine, as well as the larger 3.8, are pushrod engine designs. The 3.3 was introduced in 1989 with the 1990 Chrysler Imperial, New Yorker, and related K-series models, and was joined in 1991 by the 3.8.
The L67 and L36 do not share pistons. L67 pistons are heavier and have a different height to lower compression. Both engines share the same engine blocks, but compression is reduced from 9.4:1 in the L36 to 8.5:1 for the L67. GM listed the engine output as 240 hp (179 kW) and 280 lb⋅ft (380 N⋅m) of torque.
The Essex V6 is an overhead valve (OHV) V6 engine with a 90° angle between cylinder banks, a single cam-in-block, and two valves per cylinder operated by pushrods and rocker arms. Split crankshaft pins permit even firing intervals.
The Chevrolet 90° V6 family of V6 engines began in 1978 with the Chevrolet 200 cu in (3.3 L) as the base engine for the all new 1978 Chevrolet Malibu.The original engine family was phased out in early 2014, with its final use as the 4.3 L (262 cu in) V6 engine used in Chevrolet and GMC trucks and vans.
It was also an OHV/pushrod engine, and was built for just two years, 1940 and 1941. This is the largest low deck engine. Bore was 3.78125 and stroke was 3.8125. Power listed as 91 Net HP @ 3000 rpm; torque 201 Net lb ft @ 1000 rpm.
A three-valve-per-cylinder design was originally slated for the LS7, which would have been a first for a GM pushrod engine, but the idea was shelved owing to design complexities and when the same two-valve configuration as the other Generation III and IV engines proved to be sufficient to meet the goals for the LS7.