1A Auto AC Delco R45TS Spark Plug Set of 8 — OE Fit for GM V8, Reliable Ignition

AC Delco R45TS spark plug set of 8 delivers reliable ignition performance and an exact fit for compatible GM V8 engines.

This four-pack set (sold as eight spark plugs) includes AC Delco R45TS plugs engineered to meet original-equipment dimensions and heat range for many Chevrolet, GMC, Buick, Cadillac, Pontiac, and Oldsmobile engines. The plugs are designed for easy replacement, consistent firing characteristics, and long-term durability when installed and gapped to factory specifications. Whether you're doing routine maintenance or rebuilding a classic GM V8, these plugs provide the correct fit and factory-style materials trusted by technicians.

Will these AC Delco R45TS plugs fit my vehicle?

These R45TS plugs match OE thread size, reach, and heat range for specific GM engines. Confirm compatibility with your vehicle’s year, make, model, and engine code before purchase to ensure proper fit and clearance.

• Common fitment: many Chevrolet, GMC, Buick, Cadillac, Pontiac, Olds V8 engines
• OE-style thread diameter and reach for specified engines
• Sold as a set of 8 — check cylinder count on your engine

How do AC Delco R45TS plugs affect starting and drivability?

Correct, properly gapped plugs support consistent ignition, smoother idling, and reliable starts. Replacing worn plugs with OEM-equivalent R45TS units restores spark efficiency and helps maintain fuel burn consistency across cylinders.

• Improves spark consistency across cylinders
• Restores factory ignition performance after plug wear
• Aids smoother idle and dependable cold starts when gapped properly

What should I know about installation and maintenance?

Install using a torque wrench to the factory-specified torque and set the electrode gap per your vehicle’s service manual. Use anti-seize on threads only if recommended by the manufacturer and replace coil boots or spark plug wires at signs of wear.

• Set gap to factory spec before installation
• Tighten to OEM torque to avoid damage or poor sealing
• Inspect wires/boots and replace if cracked or oily

Are these copper, platinum, or iridium plugs and what does that mean for lifespan?

AC Delco R45TS are designed to the original equipment specification for the model family they serve; service life depends on the plug material and the engine application. Review the part details and maintenance intervals in your vehicle manual to determine expected replacement frequency.

• Material and life depend on OE design for that engine family
• Follow scheduled interval recommendations in owner’s manual
• Replace sooner if misfiring, rough idle, or fuel economy drops

Who this set is for: technicians, DIY mechanics, and owners of compatible GM vehicles who want an OE-style replacement spark plug set for tune-ups, restorations, or routine maintenance. Choose the AC Delco R45TS set if you need a direct-fit plug sold in a quantity suitable for 8-cylinder engines and you want parts that match factory fit and function. Always confirm fitment with your vehicle’s VIN, year, and engine code before ordering to ensure correct selection.