Autolite AP145 spark plug for the 1975-1979 Chevrolet P30 V8 5.7L, the 1975-1989 P30 6-cylinder 4.8L, the 1975-1990 P30 V8 7.4L, the 1976 P30 V8 6.6L, the 1985-1986 P30 V8 5.7L and other vehicles and equipment ignites the air-fuel mixture in the cylinder. It is a platinum plug aimed at older engine applications and designs.
- Platinum center electrode firing tip for quicker firing and smoother starts
- Platinum firing tip that prevents gap erosion for longer service life
- High alumina ceramic insulator for thermal conductivity and insulation strength
- Multi-rib insulator that prevents flash-over
- Nickel-plated shell that resists corrosion
Quick facts
- Part: Autolite AP145 spark plug
- Fits: the 1975-1979 Chevrolet P30 V8 5.7L, the 1975-1989 P30 6-cylinder 4.8L, the 1975-1990 P30 V8 7.4L, the 1976 P30 V8 6.6L, the 1985-1986 P30 V8 5.7L and other vehicles and equipment
- Condition: New
Hard starting, a rough idle or a misfire can mean a plug is worn. Before you replace the plugs, rule out the ignition wires, the coil and fuel delivery, since those can also make an engine run rough.
Fits
The vehicles it fits include the 1979 GMC P3500 V8 5.7L, the 1979-1989 P3500 6-cylinder 4.8L, the 1979-1990 P3500 V8 7.4L, the 1980 Chevrolet B60 V8 6.0L and the 1980-1990 B60 V8 5.7L, besides the Chevrolet runs named at the top. The 1975-1990 Chevrolet P30 V8 7.4L takes eight plugs, while the 1975-1989 P30 6-cylinder 4.8L takes six. If yours is not named here, look it up in the "Vehicles it fits" section.
Specifications
Fit and size
- Thread: M14 - 1.25, metric, 14 mm diameter
- Hex size: 5/8 in
- Seat type: Tapered
- Pre-gap: 0.04 in (1 mm)
- Heat range: 8
- Center electrode projection: Short
- Quantity per vehicle: 6 for L6-4.8L, 8 for V8 engines
Build and materials
- Center electrode: platinum tip, copper core
- Ground electrode: nickel tip and nickel core
- Insulator: ceramic
- Resistor plug: 4000 ohm
- Terminal: non-removable nut
- Condition: New
- Warranty: Autolite 4 year limited warranty
- Country of origin: Mexico
In the box
One spark plug. A washer is not included.
Interchange: HR9APX+
10 · 4000 · 121 · 5029 · ARF4 · ARF6 · ASF4C · SP410 · 4323 · YR5VX
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
10, 4000, HR9APX, HR9APX+, 121, 5029, ARF4, ARF6, ASF4C, SP410, 4323, YR5VX
Frequently Asked Questions
Does the Autolite AP145 spark plug fit the 1975-1990 Chevrolet P30 V8 7.4L?
Yes, the Autolite AP145 fits the 1975-1990 Chevrolet P30 V8 7.4L, which takes eight plugs. For any other vehicle or machine, look it up in the "Vehicles it fits" section.
Is the AP145 one of the Autolite copper spark plugs?
No. The Autolite AP145 is a platinum plug, with a platinum firing tip on the center electrode and a copper core inside it.
Are Autolite platinum spark plugs such as the AP145 pre-gapped?
Yes, the Autolite AP145 has a pre-gap of 0.04 in (1 mm).
What thread size and heat range does this spark plug have?
This plug has an M14 - 1.25 metric thread, a 5/8 in hex, a tapered seat and a heat range of 8.
Does the AP145 spark plug come with a washer?
No. The Autolite AP145 comes as one spark plug, and a washer is not included.
