SBC BBC Long Water Pump Bolts Stainless Steel Kit Small Big Block Chevy 350 396 454 - Bolt Kit for Installing the Water Pump to Block - Fitment: Fits 265, 283, 302, 305, 327, 350, 396, 400, 402, 427, 454, 502 SB BB Chevrolet Engines; Fits Most Cast Iron & Aluminum "LONG" Water Pumps; Will Not Fit: "SHORT" Water Pumps; Will Not Fit: GEN II, III, IV, V Engines (LT1, Vortec 4.8 5.3 5.7 6.0 6.2L, LSX, LT5 Engines). - Specifications: Hardened 304 Stainless Steel; (4) 3/8" x 2" Allen Socket Head Bolts (semi-polished); (4) 3/8" Mil-Spec AN Washers (polished); Accepts 5/16” Allen Key / Allen Socket for Install.