| Y-BLOCK DISPLACEMENT CHART | |
| STROKE | |
| 3.10" | 3.30" | 3.44" | 3.51" | 3.64" | 3.70" | ||
| BORE | |||||||
| 3.50"
std. 239 3.53" +.030 239 3.54" +.040 239 3.56" +.060 239 3.62" std. 272 3.65" +.030 272 3.66" +.040 272 3.68" +.060 272 3.75" std. 292 3.77" +.020 292 3.78" +.030 292 3.79" +.040 292 3.80" std. 312 3.81" +.060 292 3.83" +.030 312 3.84" +.040 312 3.86" +.060 312 3.875" Custom 3.912" Custom |
239 243 244 247 256 259 261 264 274 277 278 280 281 283 286 287 290 292 298 |
254 258 260 263 272 276 278 281 292 295 296 298 299 301 304 306 309 311 317 |
265 269 271 274 283 288 290 293 304 307 309 310 312 314 317 319 322 324 331 |
270 275 276 279 289 294 295 299 310 313 315 317 318 320 324 325 329 331 338 |
280 285 287 290 300 305 306 310 322 325 327 329 330 332 335 337 341 343 350 |
285 290 291 294 307 310 311 315 327 330 332 334 336 337 341 343 346 349 356 |
|
| NOTES: For 256 use 272 bores with 3.10" stroke. 3.10" stroke is "EBU" crankshaft from '54 239 or '54-55 256 cubic inch engines. 3.30" stroke is "EC" crankshaft from '55-57 272 or '55-64 292 cubic inch engines. 3.44" stroke is "ECZ" crankshaft from '56-60 312 cubic inch engine. 3.51" stroke is "ECZ" crankshaft offset ground to 2.100" rod journal for aftermarket connecting rods. Assumes starting with .020' undersize journal. 3.53" is maximum offset with standard diameter rod journal. 3.64" stroke is accepted maximum stroke without rod/camshaft interference. Longer strokes require reduced base circle cams, 2.00" rod journals, additional clearance grinding of connecting rods #1-3-5-7. Equalize weight of #2-4-6-8. Not shown. Standard 3.30" stroke cranks can be offset ground to 3.41 stroke. |
|||||||