At The Race of Gentlemen, Brian Bass brought his 32 roadster with a mostly stock flathead. A week before the race, he obtained this new H&H Scot blower and decided to bolt it on before the race. It sure woke the engine up.
On about his 3rd race, I was in the other lane and near the end of the run, we could both hear a loud *POP* as if the car transmission popped out of second gear. However, he didn't remember it popping out of gear. He drove it back to the pits, idled the engine, revved it and heard no knocking or any unusual noises.
He went back out on the track and raced 3 more times HARD and winning, and then drove the car back to his trailer about a mile away. When loading the car, he noticed dents in the oil pan.
upon getting back to Dallas and dropping the pan, he found the main cap had sheered both main studs. Very lucky he didn't grenade the engine, but also an interesting occurance.
Anyways, The supercharger can put enough force to blow the main cap!
