Dwell readings changing?

Replacing the bushing in the block requires 2 special tools - one for removal, the other for installation. The installer actually does 2 jobs - it installs and burnishes the bushing to the proper size and finish. I would strongly recommend renting/borrowing the proper tool if you are going to replace this bushing. Chrysler tool numbers - C-3052 for removal; C-3053 for installing.