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The Supertech dual valve spring kit for the Audi V8 4.2L 40-valve engine supplies matched inner and outer springs designed for that cylinder head. This kit is intended for Audi V8 4.2L applications where dual springs are required, and it’s used when replacing worn springs or rebuilding the head to maintain correct valve seating and lift characteristics in the 40-valve V8.
Supertech Audi V8 4.2L 40V Dual Valve Spring Kit
