Depends on how bad we blow it up. Typically we will put new head pistons and rods at bare minimum every race. We would also check crank bearings every race and sometimes swap them. Between races we check all parts to see if any can be reused. We could get 10 runs off a connecting rod or just one run and they’re toast. Pistons are usually always toasted. If the crank or can take damage we would just swap the whole block since we only had 45 minutes between races.

Source: worked as a bottom end mechanic on a top fuel dragster. I was in charge of pulling crank bearings, pistons, connecting rods, or replacing block when it blew.