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Compression Ratio/Cylinder Head Interchange
If you are thinking of changing the cylinder heads on your engine or are building an
engine with a mix of different years parts, you may want to look at this chart to get an idea of what
might happen to your compression ratio when you mix different year blocks and heads.
Engine/ Combustion Chamber Volume(ccs) |
45 |
54.5 |
49.2 |
53.5 |
63 |
58.2 |
60.4 |
58* |
63* |
69 |
55.4 |
221 |
8.7 |
7.6 |
8.2 |
7.7 |
6.9 |
7.3 |
7.1 |
|
|
6.4 |
7.5 |
260 |
9.9 |
8.7 |
9.3 |
8.8 |
7.9 |
8.3 |
8.1 |
|
|
7.4 |
8.6 |
63-64 289-2V |
10.2 |
9.0 |
9.6 |
9.1 |
8.2 |
8.6 |
8.4 |
|
|
7.7 |
8.9 |
65-67 289-2V |
10.6 |
9.3 |
10.0 |
9.4 |
8.7 |
8.9 |
8.7 |
|
|
7.9 |
9.2 |
64 289-4V |
10.1 |
9.0 |
9.6 |
9.1 |
8.2 |
8.6 |
8.4 |
|
|
7.7 |
8.9 |
65-67 289-4V |
11.5 |
10.0 |
10.8 |
10.2 |
9.0 |
9.5 |
9.2 |
|
|
8.4 |
8.8 |
65 HP289 |
12.3 |
10.5 |
11.6 |
10.7 |
9.4 |
10.0 |
9.8 |
|
|
8.8 |
10.3 |
64-67 HP289 |
12.3 |
10.5 |
11.6 |
10.7 |
9.4 |
10.0 |
9.8 |
|
|
8.8 |
10.3 |
68-72 302-2V |
11.4 |
10.0 |
10.7 |
10.1 |
9.0 |
9.5 |
9.3 |
|
|
8.4 |
9.9 |
302-4V |
11.3 |
9.9 |
10.6 |
10.0 |
8.9 |
9.4 |
9.2 |
|
|
8.3 |
9.8 |
73-76 302-2V |
9.2 |
8.3 |
8.8 |
8.4 |
7.6 |
8.0 |
7.8 |
|
|
7.2 |
8.2 |
77- 302-2V |
11.2 |
9.8 |
10.5 |
9.9 |
8.8 |
9.3 |
9.1 |
|
|
8.4 |
10.3 |
69 Boss 302 |
|
|
|
|
|
|
|
11.0 |
10.5 |
|
|
70 Boss 302 |
|
|
|
|
|
|
|
11.0 |
10.5 |
|
|
351W 4V |
13.2 |
11.5 |
12.4 |
11.7 |
10.4 |
11.0 |
10.7 |
|
|
9.7 |
11.3 |
69-72 351W-2V |
11.4 |
10.1 |
10.8 |
10.2 |
9.2 |
9.7 |
9.5 |
|
|
8.7 |
10.0 |
73-76 351W-2V |
10.2 |
9.2 |
9.7 |
9.3 |
8.5 |
8.9 |
8.7 |
|
|
8.0 |
9.1 |
77- 351W-2V |
10.4 |
9.4 |
9.9 |
9.5 |
8.7 |
9.1 |
8.9 |
|
|
8.2 |
10.0 |
80- 255 |
10.1 |
8.9 |
9.5 |
10.0 |
8.1 |
8.5 |
8.3 |
|
|
7.6 |
8.8 |
Notes:
* Interchange of Boss 302 heads to non-Boss engines is not practical.
Compression ratios shown in bold are for originally installed cylinder heads.
All information from HPBooks "how to rebuild your SMALL-BLOCK FORD ©1980"
The original table has been rotated to better fit on the page.
To identify specific combustion chamber volumes by head casting numbers, refer here.
Please direct questions, comments, or suggestions about this page to:
Lee Lafountain
This page is provided by MustangII.org
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©1997-2010 D'TechnoArt Designs, &
©1999-2014 Lee Lafountain
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