Sealed Power 502NP piston set for the 1987 Cadillac Allante V8 4.1L and other vehicles carries combustion force to the connecting rods. Some catalogs list it as an engine piston set.
- Cast from FM132 eutectic proprietary alloy
- Cast aluminum construction with a recessed piston head
- Cast piston set that is not oversized
- Ring thicknesses of 2.00 mm for the top and second compression rings and 4.00 mm for the oil ring
Quick facts
- Part: Sealed Power 502NP piston set
- Also called: engine piston set
- Fits: 1987 Cadillac Allante V8 4.1L and other vehicles
- Material: Cast aluminum
- Condition: New
Worn pistons can show up as blue exhaust smoke from burning oil, a knocking noise from the engine or low compression. These signs alone do not prove the pistons are at fault, since worn piston rings or a leaking head gasket are another common source.
Fits
These Sealed Power pistons fit a wide range of vehicles; the top ones include the 1987 Cadillac Allante V8 4.1L, the 1985-1987 Cadillac Commercial Chassis V8 4.1L and the 1982-1987 Cadillac DeVille V8 4.1L. They meet or exceed OEM specifications. Open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Quantity per vehicle: 8
- Bore diameter: 3.4646 in
- Piston pin outside diameter: 0.8658 in (21.991 mm)
- Compression height: 1.630 in
- Pin offset: 0.06 in (1.524 mm)
- Ring thickness: top and second compression 2.00 mm, oil 4.00 mm
Build and materials
- Construction: cast piston set
- Piston material: cast aluminum (FM132 eutectic proprietary alloy)
- Piston head type: recessed
- Size: not oversized
- Condition: new
- Country of origin: Mexico
In the box
One cast piston set. The V8 4.1L takes eight pistons, and assembly lubricant is not included.
Interchange: P547 · P547STD · 91820 · 2242359 · TC2359 · 1166P · 1621703 · 1623538 · 9129PA · 1820 · Z8354 · Z8354STD
This part cross-references / interchanges with the following part numbers:
P547, P547STD, 91820, 2242359, TC2359, 1166P, 1621703, 1623538, 9129PA, 1820, Z8354, Z8354STD
Frequently Asked Questions
Do these Sealed Power cast pistons fit the 1987 Cadillac Allante V8 4.1L?
Yes. Sealed Power 502NP fits the 1987 Cadillac Allante V8 4.1L. For any other model and engine, check your own car in the "Vehicles it fits" section.
What bore size is this Sealed Power engine piston?
The bore diameter is 3.4646 in, and the set is not oversized. Compression height is 1.630 in and the piston pin outside diameter is 0.8658 in (21.991 mm).
Is this Sealed Power piston set made of aluminum?
Yes. Sealed Power 502NP pistons are cast aluminum, cast from FM132 eutectic proprietary alloy.
Does the 502NP piston set include assembly lubricant?
No. Assembly lubricant is not included and is bought separately. The V8 4.1L takes eight pistons.
Does Sealed Power 502NP replace P547?
Yes. P547 is one of the numbers this Sealed Power piston set replaces, along with P547STD, 1166P and 9129PA.
