Do these need upgraded springs and retainers if Im not revving past the stock Rev limiter? I have gotten yes and No and I need to know before I get rid of my 272s for these? The information is below!

Adv. Dur.: 280/280
Dur @ .050: 218/216
Lift (in): .425"/.408"
Lift (mm): 10.80/10.36

Thanks

 

i dont know the answer to your question, but if you need Valve Springs i have them

 

How much for them? I am insanely low on cash and am trying to get my car back together. I have been thinking about the 280s because Im more into Drag and want a little more up top, but I have to sell my 272s before I can get the other stuff.

 

I would upgrade them.