Originally Posted by sonic rx
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
9.6mm lift= .377" of lift. This is what is quoted on the helix website.