T-6 lightweight aluminum, blue anodized. Used in high lift, up to .600" valve lift, applications. Allows cam grinds C, D, M, 9, 10, Z, 3 to be installed without machine work. Note: See fmc-503-550 for required matching Andrews .600" high lift valve springs.
Fits: > 48-65 Panhead; 66-84 Shovelhead (NU)
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