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I've never heard of a typical inline valve head and their various chamber designs benifiting from anything less than 34 degrees, regardless of stroke or bore. When a Yates type canted valve C-3 head is being used with thier shallow tight chambers and dished pistons much less timing lead is required they are MUCH more efficient.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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