Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Rocker contacting top of retainer on vortec heads
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Old 01-10-2013, 02:48 PM
ap72 ap72 is offline
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Originally Posted by MouseFink View Post
The problem being discussed is:
The clearance between the self aligning rocker arm rails and the valve lock (aka, keepers). The + .050" locks does nothing to provide more clearance. The + .050" locks will lengthen the valve spring by .050", provide .050" clearance between the retainer and the valve seal and will reduce valve spring pressure. .050" x spring rate per inch.

The Manley SS valves for Vortec heads have .290" tips and will solve the problem of self aligning rocker arm to valve lock clearance. The .290" tips provide .040" clearance whereas the 1955-1995 SBC valves with .250" tips provide .000" clearance. Using 1955-1995 valves and self aligning rockers can toss the self aligning rocker arms off the valve stems, or worse.

When you are using self aligning rocker arms:
1. Must use valves with .290" tips.
2. Must avoid valve float at all costs.
3. Must use hydraulic lifters.
He said retainers, not locks, and also mentioned there was no contact with stock locks instead of the .050". I was just going off of what the OP posted. If it were locks I'd just grind a little off the top of the locks, .050" isn't going to harm it.

And since when do you have to use a hydraulic cam with self aligning rockers? I never heard that one. I ask because I have a solid cam I will be running with stock self aligning rockers.
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