This Page Last Updated on: Saturday, September 23, 2006 11:14 PM



Pontiac Overbore Specs
Stock Bore Stock Stroke Overbore (inches) New Bore (inches) New Displacement
3.750 2.750 0 3.750 287
.030 3.780 292
.060 3.810 296
4.000 3.000 0 4.000 301
.030 4.030 306
.060 4.060 311
3.9375 3.250 0 3.9375 317
.030 3.9675 321
.060 3.9975 326
3.720 3.750 0 3.720 326
.030 3.750 331
.060 3.780 337
3.9375 3.5625 0 3.9375 347
.030 3.9675 352
.060 3.9975 358
3.880 3.750 0 3.880 355
.030 3.910 360
.060 3.940 366
4.0625 3.5625 0 4.0625 370
.030 4.0925 375
.060 4.1225 381
4.0625 3.750 0 4.0625 389
.030 4.0925 395
.060 4.1225 400
4.1212 3.750 0 4.1212 400
.030 4.1512 406
.060 4.1812 412
4.09375 4.000 0 4.09375 421
.030 4.12375 427
.060 4.15375 434
4.120 4.000 0 4.120 427
.030 4.150 433
.060 4.180 439
4.1522 4.210 0 4.1522 456
.030 4.1822 462
.060 4.2122 469