Gasoline engines can tap 1,800 on sustained hard pulls, and just for kicks, nat-gas motors are nearly knocking on 1,900 on the exhaust side during a hard pull. Metallurgy becomes far more critical at those temps. So really the head, exhaust manifolds and turbine are subjected to harsher conditions in a gasoline/CNG motor than a diesel.
I don't know where these figures are coming from but I have a few real expensive ashtrays because of EGT's above 1,600 in some of my gasoline turbo engines. I know without piston squirters; gas, diesel or any other fuel you had better not go above 1,600 degrees for very long or you too can have real expensive ashtrays.
