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I personally don't like the idea of used cams, but some of my friends have tried to relate it to buying a used exhaust.
Tomei PONCAMS are super cheap on auctions...I paid 20,000-30,000Y for mine, new. (Can't remember exactly, but I bought them on auctions).
I don't personally know anybody with BC cams for the SR. My friend bought them for his 1j (jzx90) and he made awesome power with them. The Japanese tuners were really amazed at how much torque they made too. They had never seen a power curve like that and were quite impressed. I am by no means trying to defend them for use in the SR because I don't know about them first hand.
You are safe to run drop in cams without doing anything else to your valvetrain. Plenty of people do it (in Japan) all day long. People in the states just like to "build" everything.
I'm sure JWT cams are great, but since you live in Japan, Tomei cams are cheap, their a great product, and tuners here are very comfortable with them.
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