Features: 1.Applicable Model: Cylinder head bolts is replacement for Chevy BBC 348, 396, 402, 409, 427, 454, 502 BB Big Block Engines, please confirm whether your model is applicable before buying. 2.Stainless Steel: This cylinder head bolt kit is made of stainless steel, has a polished surface and is resistant to high temperatures, can be used for a long time without damage. 3.Strong Connection: These bolt kits provide excellent strength and ensure that the cylinder head is properly and tightly connected to the cylinder without loosening. 4.Size: The bolt size is 1/4in x 1 1/2in double end bolt, the nut size is 1/4in hexagonal locking flange nut, please check carefully if the size is what you need before buying. 5.Easy to Install: The screw kit is used to install the cylinder head to the cylinder, simple and convenient operation, no professional skills are required, you can install yourself. Specification: Item Type: Cylinder Head Bolts _x000D_ Material: Hardened 304 stainless steel_x000D_ _x000D_ Bolt Size: 1/4in x 1 1/2in double end bolt_x000D_ Nut: 1/4in hexagon locking flange nut_x000D_ Used to install the cylinder head to the cylinder_x000D_ Fitment:_x000D_ Replacement for Chevy BBC 348, 396, 402, 409, 427, 454, 502 BB Big Block Engines PackageList: 14 x Screw 14 x Nut