Valve Springs
Info provided by Calvin of Nivlac57 Youtube Channel, and Richard Holdener of the Richard Holdener Youtube Channel
The factory Valve Springs had two revisions. The early (02-05) springs were a straight spring. The later (06+) springs were beehive springs.Â
The factory valve springs are pretty decent. We have had 80 valve springs at 16 psi of boost and had no issues making power. That being said if you feel the need to upgrade, I looked through 100s (if not 1000s) of valve springs and found a set of 2JZ valves spring that work with the factory (02-05) retainers.
