at one time it was done. but there is so much cheap parts to build a 4.250 stroker crank 489-030.over and 060 -496 . a 125 crank 060 over would be a 482 cid if you are going to stroke i would go 4.250 have done many they work good and have done 4.375 in the 9.800 block a 4.375 crank gets a 511cid