What could cause this? 360 problems ####update####

Yep, that’s what we did. All of it. If we were caught up and getting a B or better we could work on teachers cars (and we got paid for that) or we could bring in cars to work on that didn’t belong to us and get paid.

I had to bring in my bosses Pontiac Ventura with a 350 chevy in it. For some reason it snapped an exhaust rocker stud. We replaced the broken stud and made 50 bucks each, which was pretty good beer money in 1980.
Some guys brought their own cars in to work on, we didn't get paid for it, it went towards our grades even if we worked on someone else's car it didn't pay anything. The tech school said that it was part of our training program and since it was a public school we wasn't eligible for pay.