Comp 901 valve springs,and retainers,locks.

My truck has run the XE262 and 901-16s for about 10 years now. All I did was lose the rotators and replace the seals when I dropped the springs in. "Perfect", no. "Right", no, not really because the exhaust valve grooves are lower on valves with rotators so the pressures are a little higher on the exhaust side. Serviceable - most definitely.