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Old 11-28-2005, 09:35 AM
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Stud boss cutting

I have vortec heads that I am having the stud bosses cut to accomodate screw in studs and guide plates for full 1.6 roller rockers. How much needs to be milled off of the bosses?

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Old 11-28-2005, 10:31 AM
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It depends on the stud. Do you have a manufacturers spec? On a generic stud with hex base I usually go for .250-.280 as ball park. Plus the thickness of the guide plate if one is used.
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Old 11-28-2005, 10:54 AM
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Stud boss cutting.

They are ARP screw in studs and CompCam guide plates. With the guide plates I am having the bosses cut down .350. So I am right in the ballpark. Thanks for the reply. They are already in the shop, so I was getting a little nervous.
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Old 11-28-2005, 05:12 PM
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It does depend upon the stud. As long as you have enough thread to achieve proper adjustment, there is no set rule as to how much you need to remove.

I remove about .420" off with the studs and plates I use, the studs have alot of threads on them. .350" should be enough
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Old 11-28-2005, 10:46 PM
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Will the push rod holes need enlarging for the 1.6 rockers?
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Old 11-28-2005, 11:04 PM
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Quote:
Originally Posted by jimfulco
Will the push rod holes need enlarging for the 1.6 rockers?
If they are rectangular holes, yes, on the side toward the stud.. .......

and definitely drill them out round if you use the screw down guide plates or guided rockers.

Rectangular holes, guide plates, or guided (rail) rocker tips...... you can only use ONE of these.

If you have round holes already, they are probably Okie Dokie.


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Old 12-09-2005, 07:30 PM
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Stud boss cutting

I got my heads back and put them on only to find out that .42 is the number that would have worked. Since I didn't want to wait while they were recut and pay even more money for maching and new gaskets plus another tear down, I opted for stock+.2 pushrods to take up the slack. And that did the trick. Engine is running like a rocket. Thanks for all the advice and help. I would have been lost without Hotroddersand the members.
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Old 12-09-2005, 08:17 PM
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The plus .200 pushrods took up the extra but you may have created another problem. Rocker arm geometry.
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Old 12-10-2005, 11:17 AM
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Stud boss cutting

Greg, how so? the roller tip rockers appear to be contacting the valve stems in the proper locations. I did not use the 1.6 full roller rockers. I used Comp Cam's magnum 1.52 roller tip rockers instead. Does this alleviate the geometry problem you mentioned and if not could you give me a little more detail as to this problem, ie what do I look at to determine that it does exist.
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Old 12-10-2005, 11:57 AM
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Rocker arm geometry

With your valves closed, you should have at least 50% or more of the slot in the rocker arm on the valve side. Having just installed longer pushrods, will take up the slack, but it may be tilting your rocker arms toward the valve too much, and this can cause one of two things.
1. The rocker arm bottoms out on the stud at or before full valve lift. That is the rocker arm will run out of slot and go solid metal to metal against the stud.
2. The pushrods will come out from under the rocker arm at higher RPM, and go through your rocker cover like a bullit.
3. When your lobe is in the full lift position, you will not achieve full valve lift, as the rocker arm is already swinging back to a lower fulcrum ratio, having achieved its fullest point of leverage prior to the point of maximum lift.
These are worst case scenerios, but I think you get the point.
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Old 12-10-2005, 01:53 PM
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So long as the contact pattern is right youre ok. You should check it for sure.

Heres a good explaination.
http://www.compcams.com/Technical/Products/Pushrods/
Its just amazing what info a guy can find on the good ole internet.

Youre not running a huge amount of lift but now that rockerarm is "tilted towards valve" at max lift its putting the same side load on valve that a cam with .300 more lift would. Thats a lot. Worst case rocker contact will be off the valve tip, 2nd worst guide wear will be excessive.
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Old 12-18-2005, 12:34 PM
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Quote:
Originally Posted by azbandit
I got my heads back and put them on only to find out that .42 is the number that would have worked.

where the stock studs screw or press in ? .42" sounds like a lot.
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Old 12-18-2005, 01:11 PM
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Stud boss cutting

If the longer rods cause a geometry problem, could the problem be alleviated by installing caps on the valve stem tips? I haven't had time to pull the covers off and check again, but will do so today.
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Old 12-19-2005, 06:28 PM
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Stud boss cutting.

The original studs were press in. With .35 milled off the bosses the pushrods were not contacting the lifters with the nuts turned to the bottom of the threads. they laked approximately .15" to allow more than 1 thread on the studs. That is why I went to .2 longer pushrods.
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Old 12-19-2005, 06:59 PM
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I suppose you could use lash caps but it's till a band-aid fix. I don't know of any that are .150 to .200 thick anyway.
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