Sealed H518CP 40 engine piston for the 1990 Chevrolet C1500 V8 7.4L and other vehicles transfers combustion force to the connecting rod and carries the piston rings that seal the cylinder.
- Helps improve cylinder sealing for less blow-by
- Retains standard ring gaps in the top groove
- DUROSHIELD skirt-coated piston; the moly-graphite coating extends engine life
- Reduces friction for higher fuel economy
- Helps prevent damage from inadequate lubrication on start-up
Quick facts
- Part: Sealed H518CP 40 engine piston
- Fits: 1990 Chevrolet C1500 V8 7.4L and other vehicles
- Material: Hypereutectic
- Condition: New
Blow-by, oil use, lower compression or a knock from the engine can mean worn pistons. They can also come from worn rings, scored bores or valve trouble, so have the cylinders inspected and measured with the engine off and cool, or let an engine shop do it, before you replace pistons.
Fits
This piston fits the 1990 Chevrolet C1500 V8 7.4L, the 1970-1976 Chevrolet Impala V8 7.4L and the 1983-1986 GMC C3500 V8 7.4L, and a V8 7.4L takes eight pistons. If your car is not named here, look for your year, model and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 8
- Bore diameter: 4.2500 in
- Oversize: 0.040 in
- Piston pin outside diameter: 0.9894 in (25.131 mm)
- Compression height: 1.625 in
- Pin offset: 0.06 in (1.524 mm)
- Top and second compression ring thickness: 0.0781 in
- Oil ring thickness: 0.1875 in
Build and materials
- Material: Hypereutectic
- Head type: Recessed
- Skirt coating: DUROSHIELD moly-graphite
- Condition: New
- Country of origin: India
In the box
Engine pistons as a set. Assembly lubricant is not included.
Installation notes
- Minimum clearance: see the piston fitting information on the carton label.
Interchange: P5019(8)040
P550H040 · 9H3403040 · TC2707040 · 2242707040 · 1252P40 · H3403040
This part cross-references / interchanges with the following part numbers:
P550H040, 9H3403040, TC2707040, 2242707040, P5019(8)040, 1252P40, H3403040
Frequently Asked Questions
Is the Sealed H518CP 40 piston right for a 1990 Chevrolet C1500 V8 7.4L?
Yes. Sealed H518CP 40 fits the 1990 Chevrolet C1500 V8 7.4L, and that engine takes eight pistons. For another car, look it up in the "Vehicles it fits" section.
What bore size is this 0.040 oversize piston made for?
This oversized piston is listed at 0.040 inch over, with a bore diameter of 4.2500 inches. Its piston pin outside diameter is 0.9894 inch (25.131 mm).
Does the Sealed H518CP 40 piston come with assembly lubricant?
No. Assembly lubricant is not included with Sealed H518CP 40, so you need to get it separately.
What does the DUROSHIELD skirt coating do on these hypereutectic pistons?
DUROSHIELD is a moly-graphite coating on the piston skirt. It is there to cut friction, which helps fuel economy, and to protect against damage when oil is slow to reach the skirt at start-up.
Does Sealed H518CP 40 replace TC2707040?
Yes. TC2707040 is one of the numbers Sealed H518CP 40 replaces, along with P550H040 and 1252P40.
