Ok, thanks Jim. Bullet tells me I can use my current springs which have 135#@1.900 and 430@1.250. Work good with my Comp 270@50 , 180@.200 .644 lift 110lda by Dwayne. This has been a great cam so not sure I will gain any thing going to this cam which is 267@50, 185@.200 on 108 with same lift. I’m also using Titanium retainers. Was really looking for advise on any opinions on these springs or if I need something different and was hoping to hear from Brad about this cam in his 452. Thanks