As members of the fourth-generation General Motors small block engine lineup, the LSA and LS9 variants share many similarities. In addition to their rugged reliability, pushrod-operated overhead valves, and 4.40-on-center cylinder bore spacing, the two supercharged engines share an LS design feature that allows them to handle substantial horsepower and torque. That feature is their aluminum engine block construction, providing the strong base upon which several generations of General Motors LS engines have relied. Their reliability and potential for massive
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