GSC Power-Division Toyota 2JZ & G16E-GTS Valvetrain

Billet camshafts are offered in S-series and R-series profiles for 2JZ-GTE, 2JZ-GTE VVTi and JDM VVTi heads, with duration figures shown in each title. Intake and exhaust valves are available in standard and +1mm head sizes, in 21-4N, 23-8N, chrome polished, super alloy and chrome alloy specifications. Valve springs range from cylindrical and dual kits to single conical, high pressure and extreme pressure conical kits with titanium retainers. Supporting hardware includes manganese bronze valve guides (standard and stopper style), chromoly spring seats, valve spring seat shims, valve keepers, Viton stem seals and DLC shim bucket tappets. For the G16E-GTS, the range covers intake and alloy exhaust valves, conical spring and titanium retainer kits, stopper-style guides and Viton stem seals.

Start with the engine code stamped on your block or head: 2JZ-GE, 2JZ-GTE, 2JZ-GTE VVTi or G16E-GTS. 2JZ applications typically appear in the Toyota Supra (JZA80) and Toyota Aristo/Soarer platforms, while the G16E-GTS is used in the GR Yaris and GR Corolla. Non-VVTi and VVTi 2JZ-GTE heads take different camshafts, so confirm which head you have before ordering. Valve listings specify head diameter and stem size (for example 6mm or 6.6mm) - oversize valves and some guides may require machining or seat work. Spring kits are matched to specific retainers and seats, and some seats are listed for a particular GSC kit number, so check those references. Several items are shared-fitment part numbers listed for more than one engine, such as 2JZ and VR38DETT spring seats.

Valvetrain work requires the cylinder head to be removed or at minimum the cam covers and timing components disturbed, so plan for gaskets, timing belt or chain hardware and fresh fluids. Valve guide replacement, seat cutting and valve lapping are machine shop tasks requiring a press, reamers and measuring equipment. Spring installation calls for a valve spring compressor and checks of installed height, coil bind clearance and retainer-to-seal clearance. Camshaft fitment requires correct timing marks, valve clearance measurement and, where applicable, shim selection. Installation by a professional workshop or engine machinist is recommended.

Do these camshafts suit VVTi 2JZ-GTE heads? Only the listings that state VVTi. Non-VVTi and VVTi camshafts are separate part numbers.

Are oversize (+1mm) valves a direct swap? No - larger head diameters generally require valve seat machining by an engine machinist.

Do spring kits include retainers and seats? It varies. Each title states whether titanium retainers and/or seats are included; separate retainers and seats are also listed.