i have a gsr motor and im planning to have a lil upgrade to the head.

ITR cams
ITR valves
ITR or BLOX valvesprings n retainters (which one is better?)

Will there be any cons and is this good for low budget?
do i need anything else ?

 

supertech springs and retainers.

 

if you plan on using stock itr cams just stick with OEM itr springs/retainers. they last forever if you don't rev your motor out of control.

if you plan on upgrading to larger cams then go with supertech. other than that, stick with oem!