PAC Racing 500 Series 10 Degree Valve Spring Retainer 1.110 in 0.710 in OD Steps Dual Spring Titanium Set of 16 GBDXSC 1996 2000 GMC K2500 FIV20002 41551 OR 1996 2000 GMC K2500 This is the standard block to go to 4" Micro Hardness Xray Diffraction
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