Knowledgeable engine builders will tell you that valve springs are among the most critically important components of any engine. You should know that Manley's new NexTek ? valve springs are designed and manufactured for optimum consistency, run after run, lap after lap. They are proven to have less load loss than other springs on the market, exhibiting superior fatigue life and enhancing than other springs on the market, exhibiting superior fatigue life and enhancing valvetrain stability valvetrain stability. Ever . Everything that counts in winning races.

•Cup and tip pushrods and ball end pushrods manufactured of 1010 steel
•Swedged end pushrods manufactured of 4130 chrome moly
•All pushrods are heat treated and black oxide finished
Also, these 6.1L pushrods are recommended if you do a cam swap from a 5.7L to most of the aftermarket cams.