Yup... Save your money and buy a stronger one. I have exploded three 7 1/4's over the years, one on the first test drive after replacing a slant 6 with a mild 318. It lasted for about 10 minutes or one hole shot depending on how you look at it. I broke the pinion and locked it solid. I've replaced about 10 other 7 1/4"s over the years that failed on other people too. A built motor with a stall will make them go boom.