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Old 01-14-2013, 06:30 AM
MouseFink MouseFink is offline
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The Comp Cams 1317 rocker arms have the alignment tabs on the rocker arms rather than on the roller tips. That makes them about .020" wider between the alignment tabs. That will cause the rocker arm alignment tabs to contact 7* retainers rather than the locks. The alignment tab location and not being narrow body for center bolt valve covers were the reasons they were taken out of production. They are rebuildable but apparently that was not a good selling point.

If you use 10* locks with a lash cap recess (and 10* retainers), the 1317 alignment tabs would fit inside the lash cap recess and may offer a bit more clearance. That is not the best way to get more clearance but it is cheaper than buying a set of Manley SS valves with .290" tips or buying a new set of aluminum, narrow body, self alignment rocker arms.

I used Scorpion 1073BL full roller, self alignment, narrow body, aluminum rocker arms. Those rockers have the alignment rails on the roller tips. They measure 0.350" between the alignment rails and better fit SB Chevy 0.343" (11/32") valve stems with negligible (0.0035") side to side movement. I am using Manley valves with .290" tips. The rocker arm alignment rails have .035" clearance from the 10* locks.
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