NASCAR Racing: engines, chevy engines, chevy engine

Question
I know some where in the past all
(even the fords) cup cars used chevy engines. I`ve been wondering what kind of engines they`re useing today
including the toyota.  thank you...

Answer
Don't know where you got that all cars used a Chevy engine....not true. They all use their own engines, Chevy using the block from a 350 SB2, Dodge a 340, Ford the famous 351 and Toyota is using a newly developed 358.
All are honed to 358 CI with an after race allowance of 359 CI (due to heat expansion).