Common Ford cylinder head combustion chamber sizesCaution:This is only a guide. You should always confirm your actual combustion chamber volume.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 cc4 valve Ford Racing CNC ported 52 cc
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)
9.58
Dish -5cc (3V)
9.45
Dish -10cc
9.33
9.21
9.09
8.98
8.87
Dish -12cc (4V)
8.77
8.66
Dish -13cc (3V)
8.56
Dish -18cc
8.46
8.37
8.27
8.18
8.10
Dish -21cc (4V)
8.01
7.92
7.84
Dish -22cc (3V)
7.76
5.0
Dish -6cc (2V)
12.47
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)
9.69
Dish -8cc (3V)
9.57
Dish -13cc
9.22
9.11
9.00
Dish -15cc (4V)
8.90
8.80
Dish -16cc (3V)
8.70
Dish -21cc
8.60
8.51
8.42
8.33
8.24
Dish -24cc (4V)
8.16
8.07
7.99
Dish -25cc (3V)
7.91
5.3
13.40
13.17
12.95
12.74
12.53
12.34
12.15
11.96
11.78
11.61
11.28
11.12
10.82
10.68
10.54
10.40
10.14
10.02
9.90
9.78
9.66
9.55
9.44
9.23
9.13
9.03
8.93
8.84
8.75
8.57
8.48
5.4
10.61
10.47
10.34
10.09
9.97
9.85
9.74
9.63
9.52
9.41
9.31
9.01
8.92
8.83
8.74
8.65
8.40
8.32
Dish -13cc (4V)
8.09
8.02
7.94
7.87
7.80
7.74
7.67
7.60
7.54
7.48
