If you cant get it out, dont drill it etc. Take a large nut ( 3/4") , center it over the broken bolt, and touch off the mig welder a few times inside the nut and weld the stud to the nut...it will come right out. Its better than taking the chance of getting drill filings in the motor.

RIP Monte Smith

Your work is a reflection of yourself, autograph it with quality.

WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.