I thought that dish pistons were for lower compression and that dome pistons were for higher compression? If so, 11.3-11.5 sounds too high. I was thinking more in the area of 9.3 or 9.4:1 compression.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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