Throw the block in the back of your truck and go to your local machine shop and ask them to mike it for you to see if it needs boring , most shops do not charge for this service because if it does need boring they know they will get the job..if it doesnt need boring , let them cut the ridges and hone the block for you , you will be alot happier and know it's right before you spend alot of money on it,,,,,Paul