These decades-old engines outlast modern ones — and anyone can fix them.

Though somewhat overshadowed by Chrysler's Hemi and big-block powerplants, the small-block Mopar engine has always been an economical way to go fast, especially if installed in a lightweight A-Body.

With a little know-how, you can soon learn how to diagnose and fix common problems with your lawn mower's engine. Ah, spring, time to get outside and do. Cut that grass! Turn that soil! So you roll ...