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Mopar LA Bore & Stroke Chart

To use this Chart

1.Confirm original displacement.
2.Select motor type and/or bore size in Column 1.
3.Confirm exact bore size in Column 2.
4.Select your stroke length in Columns 3-6.
5.Displacement appears in the intersecting box.
Bore, Inches
(Relative)
Bore, Inches
(Absolute)
273, 318 & 340
3.31” Stroke
360
3.58” Stroke
Mopar
3.79” Stroker
Mopar
4.00” Stroker
Std. 2733.625273296313330
   +.0103.635275297315332
   +.0203.645276299316334
   +.0303.655278300318336
   +.0403.665279302320338
   +.0503.675281304322339
   +.0603.685282305323341
   +.0703.695284307325343
   +.0803.705285309327345
   +.0903.715287310329347
   +.1003.725289312330349
Std. 3183.910318344364384
   +.0103.920320346366386
   +.0203.930321347368388
   +.0303.940323349370390
   +.0403.950324351372392
   +.0503.960326353373394
   +.0603.970328355375396
   +.0703.980329356377398
   +.0803.990331358379400
   +.090; Std. 3604.000333360381402
   +.0104.010412
   +.0204.060343371393414
   +.0304.070345373394416
   +.0404.080346374396418
   +.0504.090348376398420
   +.0604.100350378400422
   +.0854.125354383405428
   +.14754.188365394418441
   +.1804.220370401424448

Notes

340 std. bore = 360 + .040”; 340 +.010” = 360 + .050”, 340 + .020” = 360 + .060”, 340 + .030” = 360 + .070”, etc.
273, 318 &  340 all use the same 3.31” (3-5/16”) stroke length.

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