BBC Oil Pan Stud Kit Bolts Stainless Steel Big Block Chevy 396 402 409 427 454 - Bolt kit for Installing Oil Pan to Block - Fitment: Fits 348, 396, 409, 427, 454, 502 BB Chevy Engines; Fits Most OEM & Aftermarket Stamped Steel & Aluminum Oil Pans; Will Not Fit: Aluminum Oil Pans with One-Piece Fel-Pro Gaskets. - Specifications: Hardened 304 Stainless Steel; (2) 1/4" x 1 1/4" Studs (polished); (2) 1/4" Hex Locking Flange Nuts (polished); (20) 5/16" x 1 1/4" Studs (polished); (20) 5/16" Hex Locking Flange Nuts (polished).