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Doug Thorley Tri Y Header
Dial-In Marker
1960-1966 Chevrolet C10 Panel CID 400
2011-2017 Ford F750
reducing misfires while improving engine performance
QA1 High Travel Coil-Over Spring - 2-1/2" I.D. x 14" Tall - 130 lb. SP950BK Doug Thorley Tri Y HeaderPowder Coated, Chrome Appearing Silicon Manganese SteelAll QA1 springs are manufactured using the highest quality chrome silicone. This material offers high strength, consistency and longer life. Cold Wound Heat Treated Shot PeenedAll QA1 springs go through intensive manufacturing processes to ensure consistency, accuracy and durability. Squared EndsAll QA1 springs are ground at both ends to ensure straight, consistent and accurate operation.
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