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lq4 is the lower horse motor coming in at like 325 flywheel hp and its the lower compression motor at 9 something. the lq9 is rated at 350 something horse and 10.5 comp
 

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lq4 was 315-325hp depending on application, 9.4:1 comp.

lq9 was 345 hp with high comp, 10:1

not sure if there was a cam difference between the two
 
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