Its an interesting approach to optimize if this is the case. They might be able to seek exotic materials that exhibit larger thermal expansion and add them in places like the bottom of the cylinder head or on the piston rods each closing the gap in the combustion chamber (increasing compression).

Depending on where in the engine they can do this, they could also put in custom/adaptable cooling so they could have some kind of control over this during the race as a tradeoff between performance and wear.