1949 - 1963 Cadillac cylinder head 5 15/16” bolt. The measurements are as follows: 7/16”x 14 x 5 15/16”- the bolt overall length is 6 1/4”. Thread length is 1”. These will fit all models of 1949 - 1963 Cadillac's, but please make sure they are correct for your application before buying. These are good used original bolts, the threads are all good, there is nothing wrong with them. Sold As Is, As Shown.