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There has been some talk lately about how stock rods compare to some of the 5140 rods on the market. I don't have any Eagle SIR rods on hand, but I do have some some RPM 5140 rods, so I took a few pictures to show the differences. The RPM rods in these pictures are 6.800 stroker versions with 2.2 journals, but the 6.605 versions are built very much the same.
Overall view of the two rods side by side. Notice the difference in the thickness of the material around the big end. Also notice that the RPM rods have 7/16" ARP bolts vs. the stocker's 3/8". While the RPM beam is narrower in width, it is about .060 thicker across the webbing.
Close-up of the small end. Again notice the thickness of material around the pin as well as the width.
Overall view of the two rods side by side. Notice the difference in the thickness of the material around the big end. Also notice that the RPM rods have 7/16" ARP bolts vs. the stocker's 3/8". While the RPM beam is narrower in width, it is about .060 thicker across the webbing.

Close-up of the small end. Again notice the thickness of material around the pin as well as the width.
