Fits 302 and 351 pedestal style cylinder heads like Ford Performance M-6049-X306 and M-6049-X307
Use with bolt-on roller rocker arms M-6564-A50, and M-6564-B351 to obtain correct lifter pre-load.
Shim kit is used to reduce lifter pre-load and includes 16 each of the following thickness shims:
.010"
.020"
.030"
.040"