I've heard that Toyota's 16-valve fours ARE interference engies. In any case, Toyota (like most other Aisian makes) have used 4 valves-per-cylinder on their fours since the late '80s. However, the Corolla (and Chevy Prisim) switched to timing-chains for '98, and the 4-cylinder Camry (as well as the 4-cylinder Honda Accord) switched for '02.
Happy Motoring, Mark
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DrDKW
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