How often do engines need to be rebuilt, and how much does it cost

Rebuild frequency is entirely up the owner. The engines are very reliable and owners typically rebuild engines due to a small drop-off in power rather than for reliability. Most racers will only rebuild an engine once at the beginning of the season if only competing in a 6-round state series. Serious competitors who race more often and want maximum power will typically rebuild the engine at the beginning of the season, then once mid-season as well. A standard ‘freshen-up’ rebuild could cost anything between $800 and $1500 depending on what work needs to be done, and whether a dyno run is included or not.