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Don't get too caught up in the dynamic compression concept. Put the cam where the engine wants it to be to achieve peak cylinder filling and never look back.

If dynamic compression was a critical measure, 9 to 1 compression ratio Craftsman Truck engines would've never made an ounce of power with their 64° closing points.
 

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What you're ultimately trying to achieve is PEAK EXPANSION and that's got a LOT more to do with cylinder filling than squeezing. Don't get a mindset going that you must have 'x' cranking compression or whatever.

When 9 to 1 was the rule for CTS the engines made stupid power, given the cylinder head limitations for that era. It was also typical to see durations @ .050" up to 280° on the intake with these engines.....
 
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