Production Block 4.1 Liter
Casting number 25506818
TOP
TIMING COVER
Features of Note:
- Notice the lifter valley with rough "holes" in the valley for oil drain back
- Notice the knock sensor provision ( hole on right side of picture)
- Notice siamesed cylinder bores
- Notice 4 bolts per cylinder
Features of Note:
- Notice oil pump provision (to of picture)
REAR
BOTTOM
Features of Note:
- Rear main is pretty beefy
- Less "ribbing" than later blocks
Features of Note:
- 14 bolt oil pan
- Thinner oil pan rails
- Thin around the oil pump pickup and webbing
CRANK
PISTON
Features of Note:
- Same as the 3.8 turbo crank
- Hard to see, but has fillets on the journals
Features of Note:
- Similar design to the turbo motor pistons
- Rods are "two dot" rods
TOP
TIMING COVER
Features of Note:
- Notice the lifter valley with rough "holes" in the valley for oil drain back
- Notice the knock sensor provision ( hole on right side of picture)
- Notice siamesed cylinder bores
- Notice 4 bolts per cylinder
Features of Note:
- Notice oil pump provision (to of picture)
REAR
BOTTOM
Features of Note:
- Rear main is pretty beefy
- Less "ribbing" than later blocks
Features of Note:
- 14 bolt oil pan
- Thinner oil pan rails
- Thin around the oil pump pickup and webbing
CRANK
PISTON
Features of Note:
- Same as the 3.8 turbo crank
- Hard to see, but has fillets on the journals
Features of Note:
- Similar design to the turbo motor pistons
- Rods are "two dot" rods