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cgflightmech
Samba Member
Joined: November 25, 2010
Posts: 2
Location: Ewa Beach, Oahu, Hawaii
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 Posted: Sun May 29, 2011 11:52 pm Post subject: Rocker Shims |
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I am making some upgrades to my motor. Its a pretty basic DP 1641, dual 34's, 003 distributor, single quiet pack. I am installing CB Performance 1.25 rockers, and swivel feet adjusters. The swivel feet don't allow enough room to set some lash in the valves. Is it normal to shim the rocker blocks to get a proper valve gap. Any advice would be welcome. Thanks...
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Sean W. Crowley
91-1039 Laaulu St. #23B
Ewa Beach, HI, 96706
808-292-9952 |
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jfats808
Samba Member
Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Mon May 30, 2011 12:01 am Post subject: |
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You need to set up your valve train geometry and get either precut or cut to fit pushrods. In your case it would be ok with HD aluminums. You dont have room cause your stock length pushrods are to long.
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2276 IDA's 86C 11-1 DD
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Check your oil levels routinely! |
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GDOG57
Samba Member
Joined: March 19, 2006
Posts: 1066
Location: Gilbert,Arizona
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| Posted: Mon May 30, 2011 12:41 am Post subject: |
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When you run swivel feet they are longer,so you have to shim up the rocker shaft or cut push rods to length. Usually CB's swivel feet come with shims.
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modok
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Joined: October 30, 2009
Posts: 27660
Location: Colorado Springs
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| Posted: Mon May 30, 2011 12:43 am Post subject: |
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If these are the porsche style, the "foot" ones, then it is usual to grind the rocker back about .060" at least and also use about .060 shims under the rockers. That is usual for mid .400"s valve lift
The shims usually come with the kit. |
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vgajames
Samba Member
Joined: June 13, 2002
Posts: 805
Location: Texas
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| Posted: Mon May 30, 2011 5:03 am Post subject: |
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| modok wrote: |
If these are the porsche style, the "foot" ones, then it is usual to grind the rocker back about .060" at least and also use about .060 shims under the rockers. That is usual for mid .400"s valve lift
The shims usually come with the kit. |
this...  |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23950
Location: SHALIMAR ,FLORIDA
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| Posted: Mon May 30, 2011 8:43 am Post subject: |
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| or remachine the end of the rocker where the foot contacts it,I have never seen any new ones that were even on the end.you probably need shorter pushrods too. and dont forget to check the oil gally hole&slot for proper oiling, it may need some help.Ive seen those varry 3-4 threads also. |
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