I bought these new and never used them, they are still in their original shrink wrap and ready to be shipped. Summit wants 295.99 for them. I'll sell them for 200.00 shipped. I believe Crane made these for Ford Motorsport.

FMS-M-6564-D351

Brand: Ford Racing Performance Parts
Product Line: Ford Racing Roller Rocker Arms
Rocker Arm Ratio: 1.7
Rocker Arm Style: Full roller
Stud Size: 3/8 in.
Rocker Arm Material: Aluminum
Self-Aligning: No
Rocker Arm Body Style: Standard
Rocker Arm Nut Style: Polylock
Maximum Spring Diameter (in): 1.550 in.
Rocker Arm Finish: Blue anodized
Quantity: Sold as a set of 16.

Rocker Arms, Stud Mount, Full Roller, Aluminum, 1.7 Ratio, Fits 3/8 in. Stud, Ford, Small Block/351W,Set of 16.

Reduce friction and increase longevity. Ford Racing's roller rocker arms have extruded aluminum bodies and a needle-bearing fulcrum to reduce friction. Ford also includes a roller tip to decrease the load on the valve guides for better longevity.