Ductile rocker contact patch issue
#1312435
09/29/12 03:28 PM
09/29/12 03:28 PM
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PJ68RT
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See pic. The rockers are only toucing on the side of the valves. I tryed several and they all seem to only be touching the side. There's .002-.003 clearance on the side of the rocker that doesn't touch the valve. What you think? What can i do here? New rockers? Thanks
Last edited by PJ68RT; 09/29/12 03:45 PM.
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Re: Ductile rocker contact patch issue
[Re: MoparBilly]
#1312437
09/29/12 03:44 PM
09/29/12 03:44 PM
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PJ68RT
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Re: Ductile rocker contact patch issue
[Re: PJ68RT]
#1312439
09/29/12 04:05 PM
09/29/12 04:05 PM
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Joined: Oct 2003
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Crizila
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You could have the pads refaced, but for 2-3 thou, I'd runem as is.
Fastest 300
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Re: Ductile rocker contact patch issue
[Re: PJ68RT]
#1312441
09/29/12 04:12 PM
09/29/12 04:12 PM
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another pic...
Last edited by PJ68RT; 09/29/12 04:12 PM.
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Re: Ductile rocker contact patch issue
[Re: PJ68RT]
#1312442
09/29/12 07:51 PM
09/29/12 07:51 PM
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Sinitro
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You need to add shims to get the proper positioning. Take the rockers and shaft, insert 1 or 2 shims so to get each rocker centered over the respective valve stem. When doing this we suggest taking another head for trial fitting. And if needed a shim can be cut down by using the Dremel and sanding wheel. Add what ever shims (# and/or thickness) are needed for each rocker alignment. Also note that after layouting out the shaft, rockers and shims fit the shaft/rockers on the head and torque it down. Sometimes after torqueing down the shaft the # of required shims and/or thickness may need to be revised as the alignment can change after torque down.. Yes it takes some time to optimize but once done, the end-result will be worth it. Just my $0.02..
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Re: Ductile rocker contact patch issue
[Re: PJ68RT]
#1312446
09/30/12 05:54 PM
09/30/12 05:54 PM
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polyspheric
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It's got to be fixed. Find an old auto shop with a Sioux or Quickway valve refacing machine, the fancy ones have rocker re-facing attachments that pilot off the shaft hole and restore the pad to parallel. RAS can do this if you don't have any locals. Make sure the bushing is a good fit, or it won't really be fixed. There are videos on Youtube of these tools in use on Ford Y blocks.
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