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When using Comp Cams Pro Magnum Rocker Arms, longer Studs must be used due to a thicker steel Trunion design, which creates a mechanical stress on the stock length Stud. AFR recommends ARP 134-7104 (or AFR 6409) Studs which are 1.895", or .250" longer than the stock 1.645" AFR 6410 Stud that originally came with the AFR 185 heads.
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