SMALL BLOCK FORD COMPRESSION RATIO CHART
Common Ford aftermarket cylinder
head combustion chamber sizes
Caution:This is only a guide. You
should always confirm your actual combustion chamber volume.
AFR 58cc /61 cc /68 cc
Dart 58cc / 64 cc
Edelbrock 60 cc / 70cc
Ford Racing 58 cc 64 cc
Trick flow Twisted Wedge, Track heat and R series 61cc / 65cc
CNC ported
Trick Flow High Ports 64 cc
World Products 58 cc /64 cc
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Combustion chamber Volume (in CC's) |
48 |
49 |
50 |
51 |
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
| 306 |
Flat Top -3cc |
11.51 |
11.34 |
11.17 |
11.01 |
10.85 |
10.70 |
10.55 |
10.41 |
10.27 |
10.13 |
10.00 |
9.88 |
9.75 |
9.63 |
9.51 |
9.40 |
9.29 |
9.18 |
9.08 |
8.97 |
8.87 |
8.78 |
8.68 |
| Dish
-13cc |
10.00 |
9.88 |
9.75 |
9.63 |
9.51 |
9.40 |
9.29 |
9.18 |
9.08 |
8.97 |
8.87 |
8.78 |
8.68 |
8.59 |
8.50 |
8.41 |
8.32 |
8.24 |
8.15 |
8.07 |
7.99 |
7.92 |
7.84 |
| Dome
+6cc |
13.38 |
13.14 |
12.91 |
12.69 |
12.47 |
12.27 |
12.07 |
11.88 |
11.69 |
11.51 |
11.34 |
11.17 |
11.01 |
10.85 |
10.70 |
10.55 |
10.41 |
10.27 |
10.13 |
10.00 |
9.88 |
9.75 |
9.63 |
| 331 |
Flat Top -3cc |
12.39 |
12.20 |
12.02 |
11.84 |
11.67 |
11.51 |
11.35 |
11.19 |
11.04 |
10.90 |
10.75 |
10.62 |
10.48 |
10.35 |
10.22 |
10.10 |
9.98 |
9.86 |
9.75 |
9.64 |
9.53 |
9.42 |
9.32 |
| Dish
-13cc |
10.75 |
10.62 |
40.48 |
10.35 |
10.22 |
10.10 |
9.98 |
9.86 |
9.75 |
9.64 |
9.53 |
9.42 |
9.32 |
9.22 |
9.12 |
9.03 |
8.93 |
8.84 |
8.75 |
8.66 |
8.58 |
8.49 |
8.41 |
| Dish
-18cc |
10.10 |
9.98 |
9.86 |
9.75 |
9.64 |
9.53 |
9.42 |
9.32 |
9.22 |
9.12 |
9.03 |
8.93 |
8.84 |
8.75 |
8.66 |
8.58 |
8.49 |
8.41 |
8.33 |
8.25 |
8.17 |
8.10 |
8.03 |
| Dome
+6cc |
14.41 |
14.15 |
13.90 |
13.66 |
13.43 |
13.21 |
12.99 |
12.78 |
12.58 |
12.37 |
12.20 |
12.02 |
11.84 |
11.67 |
11.51 |
11.35 |
11.19 |
11.04 |
10.90 |
10.75 |
10.62 |
10.48 |
10.35 |
| 347 |
Flat Top -3cc |
12.91 |
12.72 |
12.53 |
12.34 |
12.17 |
11.99 |
11.83 |
11.66 |
11.51 |
11.35 |
11.20 |
11.06 |
10.92 |
10.78 |
10.65 |
10.52 |
10.39 |
10.27 |
10.15 |
10.04 |
9.92 |
9.81 |
9.70 |
| Dish
-18cc |
10.52 |
10.39 |
10.27 |
10.15 |
10.04 |
9.92 |
9.81 |
9.70 |
9.60 |
9.50 |
9.40 |
9.30 |
9.20 |
9.11 |
9.02 |
8.93 |
8.84 |
8.75 |
8.67 |
8.59 |
8.51 |
8.43 |
8.35 |
| Dome
+6cc |
15.03 |
14.76 |
14.50 |
14.25 |
14.00 |
13.77 |
13.55 |
13.33 |
13.12 |
12.91 |
12.72 |
12.53 |
12.34 |
12.17 |
11.99 |
11.83 |
11.66 |
11.51 |
11.35 |
11.20 |
11.06 |
10.92 |
10.78 |
| 357 |
Flat Top -3cc |
13.26 |
13.06 |
12.87 |
12.68 |
12.49 |
12.32 |
12.14 |
11.98 |
11.81 |
11.66 |
11.50 |
11.36 |
11.21 |
11.07 |
10.93 |
10.80 |
10.67 |
10.54 |
10.42 |
10.30 |
10.19 |
10.07 |
9.96 |
| Dish
-18cc |
10.80 |
10.67 |
10.54 |
10.42 |
10.30 |
10.19 |
10.07 |
9.96 |
9.85 |
9.75 |
9.64 |
9.54 |
9.44 |
9.35 |
9.25 |
9.16 |
9.07 |
8.98 |
8.90 |
8.81 |
8.73 |
8.65 |
8.57 |
| 363 |
Flat Top -3cc |
13.43 |
13.23 |
13.03 |
12.84 |
12.66 |
12.48 |
12.30 |
12.13 |
11.97 |
11.81 |
11.65 |
11.50 |
11.36 |
11.22 |
11.08 |
10.94 |
10.81 |
10.68 |
10.56 |
10.44 |
10.32 |
10.21 |
10.09 |
| Dish
-22cc |
10.44 |
10.32 |
10.21 |
10.09 |
9.98 |
9.88 |
9.77 |
9.67 |
9.57 |
9.47 |
9.38 |
9.28 |
9.19 |
9.19 |
9.02 |
8.93 |
8.85 |
8.77 |
8.69 |
8.61 |
8.53 |
8.45 |
8.38 |
| 393 |
Flat Top -3cc |
14.49 |
14.27 |
14.05 |
13.85 |
13.64 |
13.45 |
13.26 |
13.07 |
12.90 |
12.72 |
12.55 |
12.39 |
12.23 |
12.08 |
11.93 |
11.78 |
11.64 |
11.50 |
11.36 |
11.23 |
11.10 |
10.98 |
10.86 |
| Dish
-13cc |
12.55 |
12.39 |
12.23 |
12.08 |
11.93 |
11.78 |
11.64 |
11.36 |
11.13 |
11.23 |
11.10 |
10.98 |
10.86 |
10.74 |
10.62 |
10.51 |
10.40 |
10.29 |
10.18 |
10.08 |
9.98 |
9.88 |
9.78 |
| Dish
-31cc |
10.18 |
10.08 |
9.98 |
9.88 |
9.78 |
9.69 |
9.59 |
9.50 |
9.41 |
9.33 |
9.24 |
9.16 |
9.08 |
9.00 |
8.92 |
8.84 |
8.76 |
8.69 |
8.62 |
8.55 |
8.48 |
8.41 |
8.34 |
| 408 |
Flat Top -3cc |
15.02 |
14.79 |
14.56 |
14.35 |
14.14 |
13.93 |
13.74 |
13.54 |
13.36 |
13.18 |
13.00 |
12.83 |
12.67 |
12.51 |
12.35 |
12.20 |
12.05 |
11.91 |
11.77 |
11.63 |
11.50 |
11.37 |
11.24 |
| Dish
-18cc |
12.20 |
12.05 |
11.91 |
11.77 |
11.63 |
11.50 |
11.37 |
11.25 |
11.12 |
11.00 |
10.88 |
10.76 |
10.65 |
10.54 |
10.43 |
10.33 |
10.22 |
10.12 |
10.02 |
9.93 |
9.83 |
9.74 |
9.65 |
| Dish
-31cc |
10.54 |
10.43 |
10.33 |
10.22 |
10.12 |
10.02 |
9.93 |
9.83 |
9.74 |
9.65 |
9.56 |
9.48 |
9.39 |
9.31 |
9.23 |
9.15 |
9.07 |
8.99 |
8.91 |
8.84 |
8.77 |
8.70 |
8.63 |
| 427 |
Flat Top -3cc |
15.61 |
15.37 |
15.14 |
14.91 |
14.69 |
14.48 |
14.28 |
14.08 |
13.88 |
13.70 |
13.51 |
13.34 |
13.17 |
13.00 |
12.84 |
12.68 |
12.52 |
12.37 |
12.23 |
12.08 |
11.94 |
11.81 |
11.68 |
| Dish
-22cc |
12.10 |
11.97 |
11.83 |
11.70 |
11.57 |
11.44 |
11.32 |
11.20 |
11.08 |
10.97 |
10.86 |
10.75 |
10.64 |
10.53 |
10.43 |
10.33 |
10.23 |
10.14 |
10.04 |
9.95 |
9.86 |
9.77 |
9.68 |
| Dish
-31cc |
10.97 |
10.86 |
10.75 |
10.64 |
10.53 |
10.43 |
10.33 |
10.23 |
10.14 |
10.04 |
9.95 |
9.86 |
9.77 |
9.68 |
9.60 |
9.51 |
9.43 |
9.35 |
9.27 |
9.20 |
9.12 |
9.05 |
8.97 |
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SBF engine compression figured
with 4.030 cylinder bore, 4.100" gasket bore, .040" gasket
thickness, zero deck, 363 and 427 with 4.125" cylinder, 4.155"
gasket |
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