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Shawn Mendenhall of Probe Industries gave us a quick education on big-block pistons. The FPS flat-top slug uses stock rings and a press-fit pin and has a stock compression height. The SRS mid-dome version can be used with open- or closed-chamber heads and has a 1.270 compression height. Compression would be about 10:1 with an 119cc head. The SRS high-dome piston is for open-chamber heads only; compression would be about 14:1. Prices start at about $435 for a set of flat-top pistons; figure on another $65 for rings.