Toyota 7MGTE:Supra head stud kit. Note: Toyota 7MGTE:Supra head stud kit. Engine: 7MGTE. Car Model: Supra MKIII. Head studs hold your head and block together. As you make more power than your engine was designed to hold from the factory, the head and the block push apart from each other, stretching the factory bolts, and causing various failures.