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1205 E Main St
Columbus, OH 43205
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Motorcraft Spark Plug (ASF42CF4)

Part # SP-450-A
2 yr replacement if defective
$6.79
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Product Information

Product Details
Part No. SP-450-A
Warranty Details (2 YR REPLACEMENT IF DEFECTIVE)
Motorcraft Spark Plugs are original equipment on Ford Motor Company vehicles engineered to meet strict Ford engineering standards to provide original equipment performance and reliability. Delivering performance, reliability and confidence, Motorcraft spa

Product Features:
  • Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
  • Backed by Motorcraft's Service Parts Warranty
  • Exact fit for Ford, Lincoln and Mercury vehicles
  • Resistant to oxidation and arc erosion.
  • Multi-rib insulator protects against misfire.
  • Service intervals of up to 100,000 miles.
  • Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
  • Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
  • Motorcraft ignition components help prevent false check engine lights.

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5 out of 5
28 Customer Reviews
100% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
28
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
Pros
No Pros
Cons
No Cons
Reviewed by 28 Customers
Thank you for having the Motorcraft plugs.
Verified Buyer - Submitted 3 years ago
My car runs great now.
Only plug I run in my Ford Trucks :O)
Submitted 4 years ago
Own a couple of 30+ year old Ford light duty trucks, have used more expensive plugs & noticed no difference.
Bottom Line Yes, I would recommend to a friend
Great
Verified Buyer - Submitted 4 years ago
Perfect OEM replacement for my mustang
Motorcraft goes with my 84 F150
Verified Buyer - Submitted 4 years ago
Regular plugs work just fine in older vehicles. I like using motorcraft in a Ford.
I would buy this item again
Verified Buyer - Submitted 4 years ago
normal plug
Displaying Reviews 1 - 5Back to Top

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does the recommended gap change when using an HEI distributor on a 1978 ford Ranchero with stock 302-2v?
Verified Reply - John the Car-Doc
Yes, Carl! This Motorcraft Spark Plug (ASF42CF4) - Part # SP-450-A is pre-gapped at 0.044"-inch from the factory and it is an exact fit for your 1978 Ford Ranchero with 302CI. However, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines with higher compression or forced induction will typically require smaller gap settings.
Hello, what is the differance between sp450 an sp450A? the other # for these plugs are ASF42C AN ASF42CA I know each # tells the specs of the plug so what would the A mean? thanks steve
Verified Reply - Steve
Hi Steve, I'm glad to assist you! The Motorcraft Spark Plug - Part # SP-450 is just the older version of the SP-450-A. Both are copper core, the heat range and the seat type are the same. The usual reason that Ford will add an A to their Motorcraft number is a switch in suppliers, example went from an Autolite to NGK manufacturer, Ford will superseded the part number, usually adding an A on the end of the part number.
GAP DIMENSION?????>1994 FORD BRONCO SMALL V8
Verified Reply - Solomon
Hi SA, I'm glad to help you! This Motorcraft Spark Plug (Part # SP-450-A) is an exact fit for your 1994 Ford Bronco and it comes in a preset gap size of 0.044"- inches. All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for.
Heat range of this copper plug? Motorcraft Spark Plug Part # SP-450-A
Verified Reply - Solomon
Hi Michael, I'm glad to help you! This Motorcraft Spark Plug Part # SP-450-A has a heat range of 4.

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