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#5
06-23-2011, 09:54 AM
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9.5:1 isn't that much higher than stock for a VORTEC. they came with a shade over 9:1 from the factory I believe as the VORTEC fast burn heads have the small 60 or 64 CC(5.0L were 60, and 5.7L were 64's) combustion chambers from thae factory VS the 78CC's of the older truck heads. I know alot of guys run them up around 10:1, but I believe they run mid grade fuel in them as well.
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