1965-69 Roller Rockers for 140 HP Engine, ratio 1.58:1 . For those of you looking to increase horse power and torque, as well as reliability, these are the Roller Rockers you have been searching for all this time! Specific to Corvair valve angles. Don't forget, you will need to use longer rocker studs. For more details, call 918-413 1548 , .