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Here's a suggestion for you. Take both heads and CC the combustion chambers. Take the milled head and start to slightly open up the chambers with a die grinder until enough metal has been removed to CC it to near original. Did you try to retard the timing a degree or two? I don't know if there are any head gasket options for a thicker gasket. Good Luck.
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38 time NHRA/IHRA drag race champ
05 SRT4 / 12.17@117 mph on DOTs / 33.0 mpg
84 Horizon / 1760 lbs / 24 mpg
95 Neon / 46 mpg
2011 Prius / 62.1 without trying!
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