These hardened, parallel-ground chrome moly washers are perfect for use under the head of cylinder head bolts. The 7/16" ID and 13/16" OD match FF1600 head bolts perfectly*, but they can be used for any purpose. The ID is chamfered on one side to allow for a radius between the bolt shank and head, but they will work with non-radiused bolts as well. Black oxide finish. Sold in packs of 10.
* Although Ford never used washers under the head bolts from the factory, many engine builders prefer to use them. They are required with the FF1600 Aluminum Cylinder Head (Part No. 162-01-Alum).