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hey guys i have heard that if you are running vortech heads on a 350 you need to have your idle and timing and spark gap set differently then if you were running stock equipment Any ideas.
 

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Technical Support Barry Grant
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Vortec head timing

The GM Vortec heads generally don't like as much total timing as the older style heads did, but the usually run better with a little more initial timing. From what we've seen about 4 degrees less total advance is a safe starting point, and 2 or 3 more initial.
You'll need to recurve your distributor to get this set properly.
 
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