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Re: Rocker Arms to tight?
[Re: Thumperdart]
#1576814
02/11/14 04:31 PM
02/11/14 04:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Not trying to be right but "been there done that" many, many times and I stand behind my "opinion" %100000000................I don`t EVER guess on ANYTHING car related but also understand I`m a nobody and that`s cool by me........... 
Well your guessing right now.... we have very little
facts about the build... no one said valve job was
done... was it .002 taken off the heads or .020..
it he measures first he will have a idea.. instead
of just throwing dollars at it
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Re: Rocker Arms to tight?
[Re: Thumperdart]
#1576815
02/11/14 04:34 PM
02/11/14 04:34 PM
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Joined: Oct 2006
Posts: 427
Sweden
Mopar Guy
mopar
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mopar
Joined: Oct 2006
Posts: 427
Sweden
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Quote:
Not trying to be right but "been there done that" many, many times and I stand behind my "opinion" %100000000................I don`t EVER guess on ANYTHING car related but also understand I`m a nobody and that`s cool by me...........
Thumper im no expert of any kind and im not trashing anybody just have an opinion and im still learning from my mistakes like i always have and guy´s like Smokie in his best D garage is the guy´s i try to learn from 
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Re: Rocker Arms to tight?
[Re: dvw]
#1576818
02/12/14 12:33 AM
02/12/14 12:33 AM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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Quote:
Why not remove the intake and measure the preload? Bend a couple pieces of thin wire 90* at the end, various thickness. Use them as a go/no go gauge between the retaining ring and lifter piston. For what its worth I've shimmed plenty of shafts due to milling. Have 3 cars running around right now. Big block with a small .460" hydraulic a 7000 rpm small block with a .540"/.570" @ 245* solid. For that matter my rocker stands for my T&Ds are shimmed .125" cause I was to cheap to buy another $400 set of pushrods. No issue with that one either. I actually mapped out the geometry change, we're talking about .010" difference in sweep across the valve at .800" lift.
Doug
Shimming rocker stands is one thing, shimming shafts is another. The rocker shaft is made to fit into the shaft mount, putting shims under the shaft will make the bottom of the shaft bigger therefore upon tightening spreads the shaft mount and splitting it. 
it's ok to butt heads, just don't do it with a butthead
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Re: Rocker Arms to tight?
[Re: rowin4]
#1576820
02/12/14 01:44 AM
02/12/14 01:44 AM
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Joined: Mar 2006
Posts: 9,847
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,847
MI, usa
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Quote:
Quote:
Why not remove the intake and measure the preload? Bend a couple pieces of thin wire 90* at the end, various thickness. Use them as a go/no go gauge between the retaining ring and lifter piston. For what its worth I've shimmed plenty of shafts due to milling. Have 3 cars running around right now. Big block with a small .460" hydraulic a 7000 rpm small block with a .540"/.570" @ 245* solid. For that matter my rocker stands for my T&Ds are shimmed .125" cause I was to cheap to buy another $400 set of pushrods. No issue with that one either. I actually mapped out the geometry change, we're talking about .010" difference in sweep across the valve at .800" lift.
Doug
Shimming rocker stands is one thing, shimming shafts is another. The rocker shaft is made to fit into the shaft mount, putting shims under the shaft will make the bottom of the shaft bigger therefore upon tightening spreads the shaft mount and splitting it.
I've used these for builds over the last 25 years.
http://chucker54.stores.yahoo.net/rocshafshim.html
Have never had a shaft crack or split. There is as much sectional area of the shim as there is of the pedestal. Therefore the load would be supported the same. Is the rocker geometry perfect,no. However availible small block rocker arms don't have perfect geometry either. Ideally with more lift the shaft should be lowered with a shorter pushrod. We're not talking Pro Stock. Will shimming work if the pushrod is a little long from milling or valve job, absolutely. Cab has the right idea to check it. Go from there.
Doug
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) once you get that done then put the drivers side rocker arm shaft and rocker arms with the two pushrods in place for that cylinder, torque them down to no more than 23 Ft. LBs 
Maybe not 
If the large one fits you can try using different diameters of gas welding rod to measure with to find out exactly how much preload you have on those two lifters 
I do 
and start. 
.