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Lowest Price GuaranteeSpark Plug1946-1949 Buick Roadmaster Series 70/Special Series 40/Super Series 50; 1949-1955 Cadillac Commercial Chassis/Series 62/Series 75 Fleetwood Skirt: Yes Sold Individually
ACDelco R45S Spark Plug is designed as an application-specific service replacement that supports proper fit, function, and system integration. Delivers the ignition spark required to initiate combustion in the engine cylinder. Verify vehicle fitment and system configuration before installation.
ACDelco R45S Features:
- Application-specific heat range, reach, and terminal configuration should be matched to the specified vehicle application
- Application-specific replacement spark plug for compatible engines
ACDelco R45S Fitment:
- 1946-1949 Buick Roadmaster Series 70/Special Series 40/Super Series 50
- 1949-1955 Cadillac Commercial Chassis/Series 62/Series 75 Fleetwood
- 1949-1951 Cadillac Series 61
- 1949 Cadillac Series 60 Special Fleetwood & Oldsmobile Series 78/Series 88/Series 98
- 1949-1952 Chevy Fleetline/Styleline Deluxe/Styleline Special
- 1950-1952 Buick Roadmaster/Super
- 1950-1953 Buick Special & Chevy Bel Air
- 1950-1955 Cadillac Series 60 Fleetwood
- 1950-1954 Oldsmobile 98
- 1950 Oldsmobile 88
- 1951-1954 Chrysler Imperial & Oldsmobile Deluxe 88/Super 88
- 1951-1956 Chrysler New Yorker/Newport/Town & Country
- 1951-1952 Chrysler Saratoga
- 1951 Oldsmobile Standard 88
- 1953-1954 Dodge Meadowbrook
- 1953-1956 Dodge Coronet
- 1953-1955 Cadillac DeVille/Eldorado
- 1953 Chevy One-Fifty Series & Oldsmobile Fiesta
- 1954-1956 Dodge Custom/Royal/Sierra
- 1954-1955 Kurtis 500M
- 1954 Oldsmobile 88/Starfire
- 1955-1956 Chrysler 300/Nassau/Windsor & Dodge C-3/Lancer
- 1955-1957 Chevy One-Fifty Series/Truck/Two-Ten Series & Dodge Truck & Plymouth Belvedere/Plaza/Savoy/Suburban
- 1955-1958 Chevy Sedan Delivery & Pontiac Chieftain/Pathfinder
- 1955-1964 Chevy Bel Air & Pontiac Laurentian
- 1955-1961 Chevy Corvette
- 1955-1966 Pontiac Star Chief
- 1955-1971 Pontiac Catalina
- 1956 Chrysler St Regis & Dodge C-4/Texan & Fargo FC4B Panel Delivery/FC4B Pickup/FC4C Pickup
- 1956-1957 Plymouth Fury
- 1956-1958 Dual-Ghia 240/500
- 1957 Dodge D100 Pickup/D200 Pickup/D300 Pickup & Fargo FK8 Panel Delivery/FK8 Pickup
- 1957-1958 Chevy Del Ray & Pontiac Super Chief
- 1957-1971 Pontiac Bonneville
- 1958-1964 Chevy Biscayne/Impala & Pontiac Strato-Chief
- 1958-1961 Chevy Brookwood/Nomad
- 1958 Chevy Yeoman & Facel Vega FVS
- 1959-1965 Checker Aerobus
- 1959-1961 Checker Taxicab & Chevy Kingswood/Parkwood
- 1959-1964 Pontiac Parisienne
- 1960-1961 Pontiac Ventura
- 1961 Checker Marathon & Oldsmobile Cutlass/F85
- 1961-1964 Chrysler Newport/Town & Country
- 1961-1963 Oldsmobile Dynamic 88/Fiesta
- 1961-1970 Pontiac Tempest
- 1962-1971 Pontiac Grand Prix
- 1963-1964 Chevy Chevy II
- 1963-1971 Pontiac LeMans
- 1964-1970 Chevy Chevelle
- 1964-1972 Oldsmobile F85
- 1964-1966 Oldsmobile Jetstar 88
- 1964-1974 Oldsmobile Cutlass/Vista Cruiser
- 1964-1971 Pontiac GTO
- 1964 Pontiac Acadian
- 1964-1969 Pontiac Beaumont
- 1965-1966 Oldsmobile Dynamic 88
- 1965-1974 Oldsmobile Delta 88
- 1966-1970 Checker Marathon
- 1967-1971 Dodge Charger/Coronet/Monaco/Polara & Plymouth Fury/Fury II/Fury III/Satellite & Pontiac Firebird/Laurentian/Parisienne
- 1967-1969 Dodge Dart
- 1967 Plymouth Barracuda/Belvedere II/VIP
- 1967-1970 Plymouth Belvedere & Pontiac Executive
- 1967-1968 Oldsmobile Delmont 88
- 1967-1974 Oldsmobile Cutlass Supreme
- 1968-1970 Checker Aerobus
- 1968-1971 Plymouth Fury I & Pontiac Acadian
- 1968 Chevy Chevy II & Plymouth GTX/Road Runner
- 1969-1970 Checker Deluxe/Taxicab & Chevy Brookwood/Camaro/Caprice/Estate/Impala/Kingswood/Nova/Townsman & Pontiac Strato-Chief
- 1970-1971 Dodge Challenger & Plymouth Barracuda/Cuda/Road Runner
- 1970 Chevy Bel Air/Biscayne/Monte Carlo
- 1971 Oldsmobile 442 & Plymouth GTX & Pontiac Grand Safari/Ventura
- 1971-1974 Oldsmobile 98/Custom Cruiser/Toronado
- 1973-1974 GMC Transmode & Oldsmobile Omega
- 1975-1976 Chrysler Cordoba/New Yorker/Newport/Town & Country & Plymouth Fury/Gran Fury
- 1975 Plymouth Road Runner
ACDelco R45S Notes:
- Verify vehicle application, position, and system configuration before installation.
Part TypeSpark Plug
BrandACDELCO
Package Height1.05
Package Width1.15
Package Length3.45
Weight0.18 PG
Hex TypeHex
Gap Size (Mm)0.89
Ground ConfigurationStandard
Product TypeSpark Plug
Center Electrode Core MaterialCopper
Reach (Mm)9.45
Center Electrode Insulator Tip Projection0.13
Ground Electrode Tip MaterialNickel
Gap Size0.035 in (0.889 mm)
Product DescriptionACDelco Gold (Professional) Conventional Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These conventional spark plugs are designed for reliability and efficient performance. They offer high-quality copper cores and outstanding suppression characteristics. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for GM fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by Gene ral Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. ⚠<b> WARNING:</b> Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Center Electrode DesignStandard
Thread SizeM14 - 1.25
SkirtYes
Insulator MaterialCeramic
Core Nose Length21
Part CategoryReplacement Parts
Pre-Gap Size0.89
Programming RequiredNo
Ground Electrode Quantity1
Washer TypeCrush
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 1Your engine having trouble starting, hesitating, or cutting out
Faq - Answer 8Yes, ACDelco has marine spark plugs for many applications.
Signs Of Wear &#38; Troubleshooting - Section 1 - HeaderSigns of wear for spark plugs include but are not limited to:
Faq - Answer 7No, cleaning your old spark plugs is not recommended. Dirty, fouled spark plugs may also have broken or chipped insulator tips, worn electrodes, or worn or missing side wires. These conditions severely affect spark plug performance. Replace your dirty, fouled spark plugs with new ACDelco spark plugs.
Faq - Answer 6Yes, pre-ignition can cause serious damage to your engine. Pre-ignition is the ignition of fuel before the actual spark occurs, which causes a rapid temperature rise in the combustion chamber that can damage engine components and melt spark plug electrodes. Causes of pre-ignition include but are not limited to a buildup of deposits that can become incandescent in the combustion chamber, improper installation torque being applied to spark plugs, and having spark plugs with a heat range that is too hot for the engine's operating condition.
Faq - Answer 5Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. Refer to your vehicle owner's manual or contact the manufacturer for more information.
Faq - Answer 4Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
Faq - Answer 3A No, diesel engines do not use spark plugs.
Faq - Answer 2Yes, if it is the scheduled time for spark plug replacement. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected.
Faq - Answer 1Yes, this interval depends on what type of spark plug your vehicle requires. Refer to your owner's manual or contact your vehicle's manufacturer for more information.
Features &#38; Benefits - Bullet 6Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
Washer(S) IncludedYes
Seat TypeFlat
Insulator Height62.97
Center Electrode Tip MaterialNickel
Ground Electrode Core MaterialNickel
Features &#38; Benefits - Bullet 2Copper core provides great heat transfer and helps optimize plug durability
Features &#38; Benefits - Bullet 3Available for use in Marine applications
Resistor TypeYes
Features &#38; Benefits - Bullet 4Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Features &#38; Benefits - Bullet 5Premium aftermarket replacement part
Manufacturer Heat Range5
Features &#38; Benefits - Bullet 1Black Onyx coating helps reduce corrosion
Reach9.5
Ground Electrode Tip DesignStandard
Electrical Terminal TypeNon-Removable Nut
Faq - Question 8Does ACDelco have marine spark plugs?
Faq - Question 7Can I just clean my spark plugs instead of replacing them?
Height (In)1.1
Faq - Question 6What is pre-ignition and can it damage my engine?
Faq - Question 5When I replace my spark plugs, should I also replace my spark plug wires?
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 2Lack of acceleration or loss of speed when driving uphill under load
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 3Cracks in the upper or lower portion of the spark plug insulator
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 4Chipped or broken insulator tips
Part FitmentDirect Fit
Faq - Question 4Are ACDelco spark plugs pre-gapped?
Faq - Question 3Do diesel engines use spark plugs?
Grade TypePremium
Faq - Question 2Should I change all of my vehicle's spark plugs at the same time?
Hex Size13/16 in
Faq - Question 1Is there a recommended interval for changing my vehicle's spark plugs?
Vendor Part NumberR45S
Package Qty1
Package TypeEA
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