Y-BLOCK DISPLACEMENT CHART

            TECHNICAL                                                                          DIMENSIONS

                                                              STROKE 

          Crankshaft  239/256       272/292            312           312-2.10"                See notes         

                                 3.10"           3.30"             3.44"            3.51"             3.64"              3.70"

BORE                             ford-y-block.com

3.50" std. 239            239               254               265               270                280                  285

3.53" +.030 239        243               258                269               275               285                   290

3.54" +.040 239        244               260                271               276               287                   291

3.56" +.060 239        247               263                274               279               290                   294

3.62" std. 272           256               272                283               289               300                   307

3.65" +.030 272        259                276               288               294               305                   310

3.66" +.040 272        261                278               290               295               306                   311

3.68" +.060 272        264                281               293               299               310                   315

3.75" std. 292            274                292               304               310               322                   327

3.77" +.020 292        277                295               307               313               325                   330                      ford-y-block.com

3.78" +.030 292        278                296               309               315               327                    332

3.79" +.040 292        280                298               310               317               329                    334

3.80" std. 312            281                299               312               318               330                    336

3.81" +.060 292         283                301               314               320               332                    337

3.83" +.030 312         286                304               317               324               335                    341

3.84" +.040 312         287                306               319               325               337                    343

3.86" +.060 312          290                309               322               329               341                    346

3.875" Custom            292                311               324               331              343                     349

3.912" Custom            298                317               331               338              350                     356

NOTES:                                                                         ford-y-block.com

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 or C1TE steel crank..

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. Some rod/camshaft interference. Clearance rods as required.

Longer than 3.70" strokes require reduced base circle cams or 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.