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Ignition coil upgrade?

Discussion in 'Performance' started by Rayyy, Jun 4, 2020.

Sponsored By: Black Bear Performance
  1. Rayyy

    Rayyy Full Access Member

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    Name:
    Rayyy
    Doing a tune up on my 2001 Yukon XL 5.3

    Is it possible to swap in round coils into a truck that came with the square ones?

    My Yukon came with the square coils (D581), however, I understand that the “newer design” ignition coils (D585) are a bit "hotter" and began getting installed into Chevy/GMC trucks in 2003? (which is why many people swap them into LS motors).

    O'Reilly, Amazon, Ebay, etc.. all state that both types of coils will fit my truck (00-02 GMC/Chevy).

    I know that the round (D585) coils will require slightly longer plug wires [9748GG vs the 9748HH for the square (D581) coils].

    I realize swapping these in will require a different mounting bracket (part 10457736), but isn’t expensive and piece of fake to bolt in.

    The dwell settings are different for the “round” D585 coils, which cost $139 per coil vs $69 for the older “square” D581 ones.

    Will the newer style coils improve performance? Better gas mileage?


    Thanks in advance to anyone who chimes in.
     
  2. bigfootchiro

    bigfootchiro Full Access Member

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    A little late, but this is the wrong thread. Post it in the newer NBS forum
     

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