Re: Broke the rocker shaft stands
[Re: HEMIFRED]
#1045172
08/01/11 08:30 PM
08/01/11 08:30 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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i've seen that happen when people use concentric steel shims. i've used eccentric soft aluminum shims without problems. there is a way to tig weld the cracks. i had a pair repaired once without any problems. using the correct filler rod and the welder knowing what he's doing is a must.
Last edited by lewtot184; 08/01/11 08:33 PM.
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Re: Broke the rocker shaft stands
[Re: AutoEngineer]
#1045173
08/01/11 08:36 PM
08/01/11 08:36 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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I gather you werent using the tapped shims... if not the shims you used will push the sides out when you tighten the shaft down... mill them off and have blocks made up or get the W-2 race head stands and mill the stands off the proper amount... not sure if any of the BB heads use the separate stands
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Re: Broke the rocker shaft stands
[Re: Cab_Burge]
#1045177
08/01/11 10:13 PM
08/01/11 10:13 PM
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Joined: Oct 2003
Posts: 1,170 Westbury, NY
bumps440
super gas
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super gas
Joined: Oct 2003
Posts: 1,170
Westbury, NY
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Quote:
Quote:
Quote:
not sure if any of the BB heads use the separate stands
The BB heads until I think 1962 used stands.
1963 was the last year for the seperate BB rocker shaft stands, 1964 and later have the cast in pedestals. 1964 was the first year of the six bolt valve covers also
The old max wedge cars used rocker stands. get the billet aluminum ones as someone pointed out put the stands on the shafts next to the old stands and try to determine how much to cut down the cast old ones.
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Re: Broke the rocker shaft stands
[Re: bumps440]
#1045178
08/02/11 12:00 AM
08/02/11 12:00 AM
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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:
Quote:
Quote:
Quote:
not sure if any of the BB heads use the separate stands
The BB heads until I think 1962 used stands.
1963 was the last year for the seperate BB rocker shaft stands, 1964 and later have the cast in pedestals. 1964 was the first year of the six bolt valve covers also
The old max wedge cars used rocker stands. get the billet aluminum ones as someone pointed out put the stands on the shafts next to the old stands and try to determine how much to cut down the cast old ones.
Looks like the set posted above are the max wedge stands with a MP P/N
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Re: Broke the rocker shaft stands
[Re: AutoEngineer]
#1045180
08/02/11 10:02 AM
08/02/11 10:02 AM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,070
U.S.S.A.
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Quote:
I just had a pair of 906 cast iron heads fully reconditioned. I was going to use a set of new steel stamped HD rocker arms, shafts and pushrods. To get the recommended hydraulic lifter preload I used .030 +.020 steel shims under the rocker shafts. The new fast ramp cam had a larger base circle and the heads were milled.
I guess I am not the first one who has got a problem like this, but how have you solved it?
By using the correct parts.
[quicktree]I don't care who has done what for how long or who says it in their sales pitch ... rocker shims are for correct rocker to valve tip geometry. if you cut your heads and your pushrods are too long you need adjustable pushrods or the correct length pushrods.[/quicktree]
But as said have the stands machined off and replace them , set their height so your rocker geometry is correct THEN get the correct length pushrods .
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Re: Broke the rocker shaft stands
[Re: JohnRR]
#1045181
08/04/11 03:17 PM
08/04/11 03:17 PM
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Joined: Jul 2008
Posts: 179 Up in the North and Far Away
AutoEngineer
OP
member
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OP
member
Joined: Jul 2008
Posts: 179
Up in the North and Far Away
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Thanks for the all good advice I am using Karakashian's cam and followed his advice on setting the lifter preload except one issue. I was not careful enough when I had to stack two concentric steel shims to obtain correct preload. Quote:
"Karakashian sets the lifter preload at 0.010 inch. Because of the nonadjustable rocker arms, this is accomplished using special shims that fit under the rocker shafts. This preload setting is especially critical after having the heads milled or changing the cam."
I should had trimmed the lengths of the steel shims to get them to “nest” together better and prevent distortion of the stand, OR I could had used eccentric soft aluminum shims, OR shorter pushrods...
Here's Hughes Engines instructions for trimming the steel shims
http://www.hughesengines.com/Upload/productInstructions/ROCKER_SADDLE_SHIM_INSTRUCTIONS.pdf
I guess am going to have the stands milled off and using the separate stands, but a few cracks were really deep and therefore should have tall stands.
Is the height of the Max Wedge and W-2 race head stands the same?
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