What is the best valve springs and lifters to run in a 525 efi it is a 2007. Part numbers if you have them .thanks for your time

Crane makes a severe indurance duty spring for that engine which is the spring that should have come from the factory its a quality piece. They also make a quality lifter. Call their tech dept. And compare prices on line they are not terribly high priced compared to other racing components. Best of luck sincerely Laz Mesa
Www.mesabalancing.com

PAC Spring TVS 1631, sent pm

Doller Offshore,,used Isky 8005A on my 525

isky 8005a tool room springs and either isky extreme lifters or the extreme moral lifters,,both made by the same company..