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Timing is a very interesting topic with these engines. I currently have 32 degrees btdc all in at around 2500. I am still messing with this. The engine has vortec heads and Chevy recommends a max of 32 degees. My vacuum is locked out at 10 degrees with the crane cam adjustable unit. I modified the unit with some help from the ignition man on the Chevelle forum website. I typically average 15-16 mpg right now. The engine runs very cool
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