Forged from 2618 or 4032 alloy, Premium series include all of the features of FHR pistons with the addition of precision, CNC-machined valve reliefs and crown, pressure fed oiling, and skirt and pin boss struts for added durability. Pistons listed accept 1/16" (top), 1/16" (second), and 3/16" (oil) rings unless noted. Sets of eight include wrist pins and spiral locks
- Piston Head Type:
- Dish
- Bore (in.):
- 4.050
- Bore (mm):
- 102.870mm
- Recommended Stroke (in.):
- 4.250 in.
- Piston Style:
- Dish, with two valve reliefs
- Compression Height (in.):
- 1.325 in.
- Piston Volume (cc.):
- -22
- Piston Material:
- Forged aluminum
- Piston Avg Weight (g.):
- 475
- Piston Ring Thickness:
- 1/16 in. x 1/16 in. x 3/16 in.
- Quantity:
- Sold as a set of 8.
- Notes:
- Pistons are made of forged 4032 alloy aluminum.
- Wrist Pin Included:
- Yes
- Wrist Pin Style:
- Floating
- Piston Pin Diameter (in.):
- 0.990 in.
- Wrist Pin Retainers Included:
- Yes
- Piston Pin Wall Thickness:
- N/A
- Piston Pin Material:
- N/A
- Piston Rings Included:
- No
- File Fit:
- N/A
- Gas Ported:
- N/A
- Gapless:
- N/A
- Make:
- Ford
- Engine Family:
- Ford big block FE
- Engine Sizes:
- 6.4L/390
- Years:
- 1961-1977
- Recommended Rod Length:
- 6.700 in.
- Top Ring Thickness:
- 1/16 in.
- Second Ring Thickness:
- 1/16 in.
- Oil Ring Thickness:
- 3/16 in.
- Compression:
- 75cc: 9.4
