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Bore/Stroke ratios and Overbore Sizes

Common bores

cc bore stroke bore/stroke ratio overbore
848 62.94 68.25 92% -
970 - - 114% -
997 62.94 81.50 77% -
998 64.59 76.2 85% -
1071 - - 103% -
1098 64.59 83.72 77% -
1209 - 76 - +20
1226 - 76 - +40
1243 - 76 87% +60
1256 - 79 - +20
1274 - 79 - +40
1275 70.61 81.28 87% -
1290 73.5 76 97% -
1293 71.2 81.28 87.5% +20
1297 - 79 87% +60
1303 - - - +30
1308 74 76 97% -
1310 (1312) 71.6 81.28 88% +40
1330 (1340) 72.14 81.28 88.7% +60
1336 - 84 - +20
1341 73.5 79 93% -
1355 - 84 - +40
1359 74 79 94 -
1368 - 86 - +20
1374 - 84 - +60
1380 73.5 81.33 90% -
1387 - 86 - +40
1400 74 81.33 91% -
1407 - 86 - +60
1425 (1430) 73.5 84 87% -
1445 74 84 88% -
1459 73.5 86 86% -
1480 74 86 86% -

1430cc is usually 1380cc that is stroked or trick-bored (move the bore centres outwards), but by using both techniques it's possible to get 1600cc.

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1275 overbore calculations

+0

70.61mm

1273.4cc

+20

71.12mm

1291.8cc

+40

71.63mm

1310.3cc

+60

72.13mm

1328.8cc

73.5mm

1379.8cc

74mm

1398.6cc

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Footer SSI Insert revised: 23-Feb-2016