Does anyone lease engines for comp racing? Or does everyone just buy there engines? I work for a engine builder out in North Carolina that builds engines for cup teams. We build Toyota engines and R07 engines. I would love for the shop to build a comp engine either with a TRD or a R07 but I think the cost to sell one would be to high for the market. I really don't know what a good comp engine goes for. You could get up to a 4.210" bore safely, and a 8.900" to maybe a 8.850" deck height. Both blocks are 4.500" bore spaceing.