www.Austin7Ulster.com › Cylinder Block - STEPPED Base Stud 3/8" to 5/16BSF Cylinder Block - STEPPED Base Stud 3/8" to 5/16BSF £3.20 STEPPED Crankcase to Cylinder Block 3/8” BSF to 5/16” BSF. STEPPED Crankcase to Cylinder Block 3/8” BSF to 5/16” BSF. Add To Cart Added! You Might Also Like Core / Welch Plug Small £0.60 Repair Plate for Side Water Manifold £11.99 Engine mounting Rubber Set £13.60 Top Water Manifold Gasket (High Compression Type) (Paper Type) £0.80 5/16” BSF Nut - cylinder head etc from £0.25