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Originally Posted by Brian Carlton
The limit on the 603 is 4°. I'm not aware of any woodruff keys for this engine.
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4 degrees of stretch is over 1% elongation, which means it is starting to damage the sprockets. It doesn't seem like a lot, but the limit is there for a reason. It doesn't matter how much timing adjustment is available, a stretched chain is eating up the sprockets in the engine (which are a lot more expensive than the chain).
peace,
sam