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8th generation of Chevrolet's full sized SUV, based on the GM GT400 platform.

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Which direction to retard timing?

350 Chevy engine needs to adjust timing. Which direction to retard?

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If this is a TBI and distributor, a timing light is needed with trigger clamped onto #1 sparkplug, flashing light aimed at the crankshaft timing marks. Does this video help? https://www.youtube.com/watch?v=c6TFXIZ6...

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Buggs Clark crwdns2934231:0crwdne2934231:0
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