1. I have 2.02/1.60 valves on non-milled ls1 heads. Will I be required fly cutt the pistons with the MS4 cam? I've heard it's not required with stock heads but didn't know if big valves made a difference...

2. I heard they are different lobe styles, will this require different length pushrods for the intake and exaust sides? If so what lengths?

3. Will it help me sleep at night?

 

you would have to check ptv on those valves. there soposed to work with "unmilled heads with stock sized valves".

they sent me stock length with my cam kit so, they should work with stock length pushrods, or atleast i hope they sent me the right ones.