Probe FPS Series Pistons for the 454 and 502 Chevrolet Based Engines are manufactured on advanced 4032 forgings; featuring forged side reliefs with internal and external bracing. Most feature double wire locks(or spiral locks in some applications), forced pin oilers with oil distribution grooves, and lock removal indentations. They also feature gas accumulator grooves in the second land and double forced pin oilers with oil distribution grooves, as well as optional gas ports. Locks, wrist pins, and lock removal indents are included.
