Originally Posted by 02Toyowrx
These cams arent AVCS, so they shouldnt have a problem.
Something to think about they are designed for the 2.0L (different Lobe seperation). They will work with a wrx/STI combo, but not to the fullest potential a cam could offer for a 2.5L application.
Helix cam lift= .377" stock USDM 2.5L STI cam lift= .380"
so for a 2.5L you arent gaining airflow, but you should get a better powerband.
helix 264 is a .413" lift and .222" at .050 mine are installed in p&ped heads with radius grind. i bet i will increase airflow big time alot more than the sti cams for sure. the are cams you are quoting lift on have a duration of 264,and 272 they have a .377,and .403 lift and at .050 they are 222,232 lift