If you are using Wild Cams, and have a 90-93 300ZX you will need these adatpers to work with the 90-93 sprockets.
Brand New JWT Heavy Duty Valve Springs for Wild Cams - $300 shipped
Used set of Ferrea Dual Coil Valve Springs with Titanium Retainers - $750 Shipped
Have approx 10k miles on them. Still in good condition.
Brand New Set of Ferrea 1mm OS Valves - $525 Shipped
Any questions please e-mail me