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D.S.S. MOD and PRO MOD COMPRESSION RATIO CHART

Common cylinder head combustion chamber volumes:

2 valve PI 44 cc ( OEM 1999 and newer)
2 valve NPI 51 cc (OEM 1992 to 1998 )
2 valve PI D.S.S. match port 44 cc (1999 and newer)
2 valve PI D.S.S. Full CNC Port 50cc (1999 and newer)
3 valve Ford Racing CNC ported 50 cc
4 valve Ford Racing CNC ported 52 cc

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Combustion chamber Volume (in CC's) 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
4.6 Dish -3cc (2V) 12.49 12.26 12.05 11.84 11.64 11.44 11.26 11.08 10.90 10.74 10.58 10.42 10.27 10.12 9.98 9.84 9.71
Dish-4cc (4V) 12.26 12.05 11.84 11.64 11.44 11.26 11.08 10.90 10.74 10.58 10.42 10.27 10.12 9.98 9.84 9.71 9.58
Dish -5cc (3V) 12.05 11.84 11.64 11.44 11.26 11.08 10.90 10.74 10.58 10.42 10.27 10.12 9.98 9.84 9.71 9.58 9.45
Dish -10cc 11.08 10.90 10.74 10.58 10.42 10.27 10.12 9.98 9.84 9.71 9.58 9.45 9.33 9.21 9.09 8.98 8.87
Dish -12cc (4V) 10.74 10.58 10.42 10.27 10.12 9.98 9.84 9.71 9.58 9.45 9.33 9.21 9.09 8.98 8.87 8.77 8.66
Dish -13cc (3V) 10.58 10.42 10.27 10.12 9.98 9.84 9.71 9.58 9.45 9.33 9.21 9.09 8.98 8.87 8.77 8.66 8.56
Dish -18cc 9.84 9.71 9.58 9.45 9.33 9.21 9.09 8.98 8.87 8.77 8.66 8.56 8.46 8.37 8.27 8.18 8.10
Dish -21cc (4V) 9.45 9.33 9.21 9.09 8.98 8.87 8.77 8.66 8.56 8.46 8.37 8.27 8.18 8.10 8.01 7.92 7.84
Dish -22cc (3V) 9.33 9.21 9.09 8.98 8.87 8.77 8.66 8.56 8.46 8.37 8.27 8.18 8.10 8.01 7.92 7.84 7.76
5.0 Dish -6cc (2V) 12.47 12.26 12.05 11.86 11.67 11.48 11.31 11.13 10.97 10.81 10.65 10.50 10.36 10.21 10.08 9.94 9.81
Dish-7cc (4V) 12.26 12.05 11.86 11.67 11.48 11.31 11.13 10.97 10.81 10.65 10.50 10.36 10.21 10.08 9.94 9.81 9.69
Dish -8cc (3V) 12.05 11.86 11.67 11.48 11.31 11.13 10.97 10.81 10.65 10.50 10.36 10.21 10.08 9.94 9.81 9.69 9.57
Dish -13cc 11.13 10.97 10.81 10.65 10.50 10.36 10.21 10.08 9.94 9.81 9.69 9.57 9.45 9.33 9.22 9.11 9.00
Dish -15cc (4V) 10.81 10.65 10.50 10.36 10.21 10.08 9.94 9.81 9.69 9.57 9.45 9.33 9.22 9.11 9.00 8.90 8.80
Dish -16cc (3V) 10.65 10.50 10.36 10.21 10.08 9.94 9.81 9.69 9.57 9.45 9.33 9.22 9.11 9.00 8.90 8.80 8.70
Dish -21cc 9.94 9.81 9.69 9.57 9.45 9.33 9.22 9.11 9.00 8.90 8.80 8.70 8.60 8.51 8.42 8.33 8.24
Dish -24cc (4V) 9.57 9.45 9.33 9.22 9.11 9.00 8.90 8.80 8.70 8.60 8.51 8.42 8.33 8.24 8.16 8.07 7.99
Dish -25cc (3V) 9.45 9.33 9.22 9.11 9.00 8.90 8.80 8.70 8.60 8.51 8.42 8.33 8.24 8.16 8.07 7.99 7.91