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Head Swap Compression Ratio Table

Compression Chamber Volumes 45 54.5 49.2 53.5 63 58.2 60.4 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
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
Compression Chamber Volumes 45 54.5 49.2 53.5 63 58.2 60.4 69 55.4

Red indicates original cylinder heads for application.


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