What's a reverse dome piston (small block)?

Seems no one knows what a reverse dome piston is. I do, so here it is.

Unlike a traditional dished piston, a reverse dome is exactly what it implies. The DIRECT opposite of a domed piston if that particular piston had a dome.

Here is where the two differ. The reverse dome retains the quench area of the piston, while a traditional dished piston does not.

The reverse dome is good in applications that otherwise would have too much compression, but still can benefit from some quench, such as long stroke, long rod strokers with small chamber heads.

Also some forced induction applications can benefit from reverse dome pistons during their low or no boost times, helping to keep the burn more efficient. Generally speaking, quench is a moot point in forced induction, but it can be used to help keep combustion cool and keep the burn even, which also of course helps fight detonation.

Reverse dome and dish pistons are NOT the same thing.