JE Pistons designed for 4.6/5.4L engines and are compatible with forced induction and nitrous applications. Low compression pistons feature our spherical dish for the ultimate in combustion efficiency. JE pistons are race proven in turbo modular motors posting mid 6-second times in the 1/4 mile. 4.6L part numbers now include valve reliefs for either 3V or 4V heads as noted below. 5.4L part numbers have no valve reliefs. Accept 1.5, 1.5, 3.0mm rings. Note: (* Compression Ratio’s for 5.4L Pistons are calculated with .120? deck clearance)

Includes:

Pin #866-2500-15-51S (109g)

Double spiro locks (#866-042-CS)

Contact reduction grooves

Double pin oilers

Compression Ratio:

42cc 8.6:1

45cc 8.3:1

52cc 7.9:1