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Old 03-02-2014, 12:12 PM   #285
Boog
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Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 12,959
Re: What did you do to your truck today? Chapter II

They are spark plugs that are shorter in overal length to give more room between the header tube and the spark plug for the wires.
I searched Summit and found these right away.
http://www.summitracing.com/parts/acc-0576s-4/overview/
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Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
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91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.

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