3 generations exist in the TOYOTA 3S-GE engine:
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1st generation: 28mm tappet with 25mm shim between cam and follower (base circle diameter 28mm)
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2nd generation: 31mm tappet with 28mm shim between cam and follower (base circle diameter 28mm)
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3rd generation: 31mm tappet with 13mm shim between follower and valve (base circle diameter 32.5mm)
! When ordering please make sure to order the camshaft that fits your application of followers and base circle diameter. 1st generation camshafts are only available on special request