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Written by Jammy_basturd
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| | | Stroke
| Inches
| 2.438
| 2.688
| 3.000
| n/a
| 3.200
| 3.296
| n/a
| n/a
| | | MM
| 61.91
| 68.26
| 76.20
| 79.00
| 81.28
| 83.72 | 84.00
| 86.00
| | Bore |
| | | | | | | | | Inches
| MM | Comments | | | | | | | | | | 2.46 | n/a | 997 Cooper | | 836 | 933 | | 997 | 1025 | | | | 2.48 | n/a | Std 850
| | 850 | 948
| | 1012 | 1042 | | | 2.54
| n/a | Std small bore
| | 894
| 998
| | 1065
| 1098
| | | 2.56
| n/a | +0.020 | | 909
| 1014
| | 1082
| 1114
| | | 2.58
| n/a | +0.040 | | 923
| 1030
| | 1099
| 1132 | | | 2.60
| n/a | +0.060 | | 937
| 1046
| | 1116 | 1149 | | | 2.62
| n/a
| +0.080
| | | 1062 | | | | | | | 2.78 | n/a | Std big bore
| 971 | 1071
| | 1239
| 1275
| | 1318 | 1349
| 2.80
| n/a | +0.020
| 984 | 1085
| | 1255
| 1293 | | 1335
| 1367 | 2.81
| n/a | +0.030
| 991 | 1092
| | 1264 | 1301
| | 1344 | 1376
| 2.82
| n/a | +0.040 | 998 | 1100
| | 1273
| 1310
| | 1354
| 1386
| 2.84
| n/a | +0.060 | 1013 | 1117
| | 1292
| 1330
| | 1374
| 1407
| n/a
| 73.50 | 73.5mm
| 1051 | 1159
| | 1341
| 1380 | | 1426
| 1460 | n/a
| 74.00
| 74.0mm
| 1065 | 1174
| | 1359
| 1398
| | 1445
| 1479
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| Key: | Blue
| Standard engine size
| | | Red | Standard overbore size
| | | Green | Other common sizes | | | Grey | Other possible sizes
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