LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Broke stud and pushrod.. what fun

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Old Mar 31, 2003 | 10:38 AM
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Talking Broke stud and pushrod.. what fun

left school thursday, heard a loud pop and car started to have a bad vibration esp. in 5th and 6th gear... but i drove it the 40 miles home and then a bit more.... noticed dent in the valve cover pulled it off saw a broke rocker stud on exhaust then noticed no pushrods saw one barly and pulled out with my finger.. it was fine... friend found part of the other one with a flash light and magnet... had to pull the intake to find the other half...
guess sh*t happens
what length pushrods everyone else use? what kind?
i been looking at these trick flow pushrods 7.2 length or should I go a little longer?
btw i have/had ARP 3/8 studs, stock 94 harden pushrods
go figure with my luck
Old Mar 31, 2003 | 02:37 PM
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got some pics.. if it dont work try copy/paste or add some spaces to the end of it and hit enter
pic of broke pushrod

pic of what I saw when i pulled the valve cover
Old Mar 31, 2003 | 10:14 PM
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ordered 7.3"... this will work right?
Old Mar 31, 2003 | 10:31 PM
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yup, should work fine. you pics are not working......
Old Apr 1, 2003 | 01:03 AM
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copy and paste the url into a new window, it will open the page.
Old Apr 1, 2003 | 09:07 AM
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Does anyone have an idea of why it broke like this? its compcams pro magnum roller rockers, stock 94 pushrods, moroso guideplates, comp "R" lifters
Old Apr 1, 2003 | 09:24 AM
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Lightbulb

I was told my every cam grinder out there that if you install 1.6 rocker arms the valve springs will bind. Thus a spring change was a must.
Old Apr 1, 2003 | 10:29 PM
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Phil did my heads and assembled them and recommended me get the 1.6 rockers... so i dont think that was it...
Old Apr 1, 2003 | 11:05 PM
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it was tight in the head... already pulled it out though
waitin for the pushrods and intake gaskets to come in so i can put it back together and ride... its my only car

anymore ideas why it broke?
and any comments on runnin a 7.300" pushrod? cause thats what i ordered
thanks
Old Apr 1, 2003 | 11:09 PM
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Originally posted by dobe
ordered 7.3"... this will work right?
Why would you get longer pushrods?
Old Apr 2, 2003 | 08:01 AM
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It's what a friend and a mechanic recommended me to get
Old Apr 2, 2003 | 10:18 AM
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AFAIK, the only reason you would change pushrod length is if you had some other changes that made the geometry different from stock. Longer pushrods will change where the tip of the rocker rides on the top of the valve.
Old Apr 2, 2003 | 01:09 PM
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How tight in the head?

You might go back and check the others and see how tight they are. I know when I got my heads the studs where only about 15 ft/lbs I went ahead and brought them up to specs. 50-55 ft/lbs.
Old Apr 2, 2003 | 03:47 PM
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Ken95Z28 - I put the studs in the heads and they were torqued to spec...

shoebox so should I send my 7.3's back and get the 7.2's?
how will i know if i cant use the 7.3?
Old Apr 2, 2003 | 05:01 PM
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Originally posted by dobe
Ken95Z28 - I put the studs in the heads and they were torqued to spec...

shoebox so should I send my 7.3's back and get the 7.2's?
how will i know if i cant use the 7.3?
I would check out the geometry you now have. If it is correct, changing the pushrod length is going to throw it off.

Here is some reference: http://www.compcams.com/information/Products/Pushrods/



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