is it...
#11
#16
the lq9 is the cadillac motor with a little more hp, the lq4 is the work truck motor, both are great, when you up grade the motor with cam and bolt ons the lq4-9 will see similar #s.
#18
Lq9 has flat pistons and lq4 has dished. IIRC the lq4 has a little bit lower compression too.



