If you mean a gear drive, there's pros and cons. The gear drive does take slightly more power to turn, and it takes grinding the back side of the timing cover for it to fit, but it's far more accurate and easier to install. The chain is cheaper and is silent to operate. But lastly, you can use a gear drive for years, even reuse it from engine to engine, as long as it doesn't get overheated (when it turns blue) or get tooth damage. I run a Pete Jackson on mine and have used it since 1993. It's been in 3 engines since then and it looks brand new.
+3 on the gear drive. It's more accurate and will never get worn out like a chain will. Yes, you could break a tooth, but the odds of that happening are pretty slim.
The noise is a little strange at first, but after a while you get used to it. I don't really hear mine anymore.
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