Proform GM LS Valve Covers - Slant Edge - Cast Gray HARZ201 12-point-headed intake manifold bolts simplify

12-point-headed intake manifold bolts simplify the job of installing and removing many of today's aftermarket intake manifolds designed with extremely tight fastener clearances

1991-1995 GMC C3500

Buick: Century 73 - 74 5

Discharge Nozzles / Fittings

Electronics stabilize readings for consistent results

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