[vector1]

the z303 valve lobe measures .345, with 1.6 rockers lift would be .552, with 1.72 rockers which i have lift would be a calculated .593. i shot an email off to afr since their afr185 heads list max .600 lift to see if i could run .593 lift which they said was fine. since the chip is now a conservative 6000rpm i don't think it will hurt to run the higher lift rockers. the 1.72 showed good marks on the valve stem when put through the lift range and didn't want to risk changing to 1.6 and having to change pushrods also. so far so good!