Square or round ignition coil for spark plugs?

2002 CHEVROLET AVALANCHE
162,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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NACHO D
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  • 2 POSTS
I am replacing O-2 and knock sensors along with harnesses etc. and want to do spark plugs and wires also. However, I did not know there were round and square ignition coils. How do I determine which I have? Does the VIN help identify that?
Jan 29, 2024 at 4:28 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

They should be the round ones. I looked up the OEM part number and attached it in pic 1 for you. Also, picture 2 shows the coil.

If you purchase an aftermarket coil, just cross reference it to GM part number, 10457730.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
Images (Click to enlarge)
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Jan 29, 2024 at 7:29 PM
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NACHO D
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Thanks, I appreciate your guidance...
Jan 30, 2024 at 8:16 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

You are very welcome. Let me know if I can help in any way.

Take care and feel free to come back anytime in the future.

Joe
Jan 30, 2024 at 9:10 PM