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1205 E Main St
Columbus, OH 43205
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Autolite Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration

Part # 403
2 yr replacement if defective
$3.49
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$8.99

Not Available in:
43205

Home Delivery

FREE for orders over $35

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Curbside pickup is available at most stores

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Product Information

Product Details
Part No. 403
Warranty Details (2 YR REPLACEMENT IF DEFECTIVE)
Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, AutoliteCopper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.

Product Features:
  • Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
  • Multi-rib insulator reduces danger of "flash-over"
  • One-piece terminal post adds strength
  • Resistor reduces radio frequency interference (RFI) and electrode erosion
Specifications
Center Electrode Core Material:
Copper

Center Electrode Tip Material:
Nickel

Electrical Terminal Type:
Removable Nut

Ground Electrode Core Material:
Nickel

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Tapered

Ground Electrode Tip Material:
Nickel

Hex Size:
13/16" in

Pre-Gap Size:
0.034 in

Reach:
19.5 mm

Resistance:
5000

Resistor Type:
Yes

Seat Type:
Flat

Thread Diameter:
14 mm

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4.66 out of 5
830 Customer Reviews
90% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
669
4 Stars
103
3 Stars
24
2 Stars
3
1 Star
31
These work well on a Honda VT1100T ACE Tourer moRecommend highly for Mercury 90 Outboard.69 RS SS Camaro yes I will buy this product again and recomm
Was correct part.NoGreat priceGreat plug for Harley Twin Cam enginesWork great in my jet boat!
Pros
55
Easy To Install
53
Improves Engine Efficiency
44
Durable
38
Increases Power
17
Lightweight
Cons
7
none
2
Difficult To Install
2
None
1
Decreases Gas Mileage
1
No Improvement In Performance
Best Uses
56
Replacement
54
Everyday Driving
18
Restoration
11
Performance Driving
6
Racing
Car & Truck
11
Casual Driver
8
Auto Enthusiast
8
Mechanic
3
Truck Enthusiast
1
Competitive Driver
Describe Yourself
28
Casual Driver
23
Auto Enthusiast
19
Mechanic
9
Truck Enthusiast
4
Competitive Driver
Most Liked Positive Review
Best plug for your Neon
These plugs do the job for stock or performance. Somebody gave them a bad rating because they 'only' lasted 40,000 miles. You are supposed to change them at 30,000 miles so that is actually a positive review. Change the stars to 5. You can't beat them for a street driven Neon.
Most Liked Negative Review
does not match NGK CPR7EA-9
This does not match the NGK CPR7EA-9 Spark plug. The tip is extended on the NGK. This Autolite has a recessed tip. Thus not getting the spark into the cylinder head as designed by the manufacture. Was being used on a Kawasaki Valcan 900.
Reviewed by 830 Customers
My Evo Harley loves this plug
Submitted a month ago
All I can say is that it's a great spark plug for my 80ci Harley engine.
Bottom Line Yes, I would recommend to a friend
I run these in two makes of pickup.
Submitted 4 months ago
Run in my 2 bar ford heads on a gm hei, and i run them on my 355 with a gm hei.
Bottom Line Yes, I would recommend to a friend
Love Lucas products
Submitted 4 months ago
I've been running Lucas oil products for years and see no reason to change.
Bottom Line Yes, I would recommend to a friend
Jason at first Colonial Rd., Virginia Beach store
Submitted 4 months ago
Jason was very helpful and very respectful when trying to order the spark plugs. This man needs a raise!
Bottom Line Yes, I would recommend to a friend
What plug is it !!!!
Submitted 6 months ago
What is this plug compatible with ????!!!! NO NUMBER shown but typical for Advance auto
Bottom Line No, I would not recommend to a friend
Displaying Reviews 1 - 5Back to Top

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Thanks ill give the 24's a shot
Verified Reply - Steve
HI William L, I'm glad to help you! If you've any automotive related inquiries regarding product fitments, specifications, diagnosis and repairs, please provide us and we will gladly assist you with any questions or concerns you may have.
Hi in replying to your request of my chevy's model is a Silverado 7.4L 4x4
Verified Reply - Steve
Hi William L, I'm glad to help you! This Autolite Copper Non-Resistor Spark Plug (Part # 255 BX) does not fit your 1987 Chevrolet Dump Truck with 7.4L engine. We do have an exact spark plug available online for your vehicle and the part number is CR43TS. Please enter your vehicle on our website and search for this part to check the fitment.
Hi in answering your request i have a 87 chevy 7.4L TBI Silverado with headers
Verified Reply - Solomon
No William, this Autolite Copper Non-Resistor Spark Plug (Part # 255 BX) does not fit your 1987 Chevrolet Silverado 7.4L. We do have an exact spark plug available online for your vehicle and the part number is 24. Please enter your vehicle on our website and search for this part to check the fitment.
Hello sorry my question should have been will your 255 spark plugs fit my 87 chevy headered Custom Deluxe 454 TBI 1ton dump truck
Verified Reply - Solomon
Hi William, happy to help you! To check the exact fit application for the part number 255 BX, please provide us with the exact sub-model and engine size of your vehicle.
Do these 255's fit my 87 chevy 454 headered engine
Verified Reply - John the Car-Doc
Hi William L! To check compatibility, please provide your 1987 Chevrolet's model, so I can assist you further.
Displaying Question & Answer 1-5

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