PAC Racing 1200 Series Valve Spring Dual Spring 550 lb in Spring Rate 1.100" Coil Bind 1.550" OD DX2750K 3 8 Inch and 1 2 Inch FIV20002 41551 OR 3 8 Inch and 1 2 Inch steel or aluminum and Direct OEM replacement Xray Diffraction We have a fully accredited metallurgy lab with dedicated staff and equipment such as: SEM with EDAX
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