Pushrod Question

[Bub]

I'm helping out a friend install some heads (GT40) and when I dropped in the push rods (stock length 5/16" diameter) it just seemed like quite a bit of play then I remember when I did mine, even with the rocker arm tightened down I can still turn the rocker with minimal effort and make the push rod touch the sides of the guide plate. Am I just being over paranoid?? I'm wondering if since it's a 3/8" stud if the heads don't have 3/8" guide plates and require 3/8" push rods. Which I thought was more of a big block thing?? I'm not sure, any input would be appreciated. Thanks.

 

[95opal]

If you cant get the correct torque on the rockers you may need shims.

 

[Bub]

the push rod literally can move from side to side and touch both sides of the guide plates, I've installed the rockers 1/2 turn past 0 lash.

 

[Bub]

https://vimeo.com/141682936

 

[BigTang]

If the gt40 heads have been remachined to run a guide plate and stud mount rockers you need a longer pushrod, not a thicker one. And as far as torquing them down that is no longer valid because they aren't pedestal mount so there is nothing to torque against.


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[BigTang]

And what's the point of the video? To show they don't bind up against the plate? Make sure you run a hardened pushrod with those plates.


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[Bub]

If the gt40 heads have been remachined to run a guide plate and stud mount rockers you need a longer pushrod, not a thicker one. And as far as torquing them down that is no longer valid because they aren't pedestal mount so there is nothing to torque against.


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I will measure again but it looked good when I used the adjusting pushrod.

Point of the video is to show the excessive play between the 3/8" guide plate and 5/16" pushrod