We were given a written assessment quiz after a few lessons. Based on how you scored, you were assigned to an engine to tear down, measure clearances, reassemble, and start up. If it started on the first attempt, the group received an A. Second attempt, an A- and so on.
The top group was assigned to a nice Pontiac 326.
Second group got a very nice Slant 6.
Third group got a Buick Nail head that had been abused by a special ed class.
Lowest scoring group received a lawn mower engine.
(Self-esteem wasn't a major concern in 1969.)
On startup day, our group's 326 started on the second try. The distributor was rotated 180 degrees.
The Slant 6 group got theirs going (not sure how many attempts) only to have one of the kids from the lawn mower group come over and dislodge a carburetor spring which caused it to go WOT. Everyone ducked behind benches until it blew. I've never seen a teacher so pissed off.