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Does a 305 Chevy engine from 1984 trans am have metal timing chain and gearset?

No, the 1984 Chevrolet 305 in a Pontiac Trans Am used a timing chain, but it was not a metal-on-metal design. It utilized a roller timing chain. This means the chain itself is metal, but the interaction with the sprockets (gears) is via rollers to reduce friction and wear. It wasn't a simple gear-on-gear setup like some older engines.