SBC VORTEC INTAKE MANIFOLD BOLTS 5/16" STAINLESS SMALL BLOCK CHEVY 327 350 400 - For Installing the Intake Manifold to Cylinder Heads - Fitment: Fits Small Block Chevrolet Engines with Vortec Heads (Casting 062 / 096); Fits Most OEM & Aftermarket Vortec Intake Manifolds; Will Not Fit: TBI Vortec Engines; Will Not Fit: GEN III, IV, V Engines (Vortec 4.8 5.3 5.7 6.0 6.2L, LSX, LT5 Engines). - Specifications: Hardened 304 Stainless Steel; (8) 5/16" x 1 1/2" Allen Socket Head Bolts (8) 5/16" Mil-Spec AN Washers; Accepts 1/4” Allen Key / Allen Socket for Install.