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Re: 440 Rocker shaft shims
[Re: lewtot184]
#1194506
03/10/12 06:32 PM
03/10/12 06:32 PM
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Joined: Jan 2003
Posts: 644
Warner Robins, Georgia
DusterMan
super street
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super street
Joined: Jan 2003
Posts: 644
Warner Robins, Georgia
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I bought some thin copper sheets and made mine. But I always
set mine around .040 to .060 preload. I would put it together and run it like it is. If you want to shim the
rockers, go for it. I have run them for years with no problems. But i never had more then about .015 to .020 shim.
Just make sure if you make them the ones that go on the oiling hole has a larger hole in it then the bolt so you don't block off the oil going to the rockers.
Pete:
2003 Dodge Quad 2500 Hemi
69 RoadRunner 4 sp Alpine White
2019 Dodge Charger
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Re: 440 Rocker shaft shims
[Re: 1964superstock]
#1194508
03/10/12 09:26 PM
03/10/12 09:26 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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Quote:
I would recommend against using shims of any kind under the rocker arm shafts ever. This can cause the rocker arm pedistals on the heads to crack, and kill your heads. The shims cause the rocker arms shafts to be effectively larger in diameter, which loads the corners of the rocker arm pedistals of the heads. In effect it acts like a log splitter. Call Ray Barton if you don't believe me. Do it right, and order the right length pushrods instead. New heads cost a lot more than new pushrods.
this is why the shims need to be eccentric. just sticking anything under the shaft can crack the rocker stand. i've never had a problem but i use aluminum eccentric shims and don't over torque.
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Re: 440 Rocker shaft shims
[Re: lewtot184]
#1194509
03/10/12 09:41 PM
03/10/12 09:41 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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aluminum or soft copper & proper hole dia on the one that feeds it & correct torque. I'd add some shims & run it
live every 24 hour block of time like it's your last day on earth
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Re: 440 Rocker shaft shims
[Re: RapidRobert]
#1194510
03/10/12 10:32 PM
03/10/12 10:32 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I have made my shims for years --I have used them on about 100 big block mopars and have never cracked a head because of shims--can it happen? Yes. Have I ever seen it ? NO and if you read Hughes website about preload--( and no matter what some think he knows) you can run anywhere between zero and two turns and more --if you want RPM out of a hyd cam use zero and put up with the noise--if you want them quiet--put 1 1/2 turns and its like a mouse peeing on a ball of cotton kinda quiet-You will be FINE with what you have unless you expect to turn it hard--like over 5500 hard. A .015 shim will not hurt one darn thing even if it is made out of a beer can IMO. PM me and I will send you a set for FREE ( not made from beer cans) and two will have the bigger hole to make you sleep better. Glad to help. One more thing the Cresent moon shaped shims ARE the best choice for thicker applications but not needed for a .015 or .030.
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Re: 440 Rocker shaft shims
[Re: bobs66440]
#1194513
03/10/12 11:42 PM
03/10/12 11:42 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I used the Mancini shims on a 383 I drove in my old Dart. Drove it for 7 years like that and raced it also. Never a problem. I like my lifter preload about .020. Ron
Last edited by 383man; 03/10/12 11:43 PM.
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Re: 440 Rocker shaft shims
[Re: JohnRR]
#1194515
03/11/12 09:48 AM
03/11/12 09:48 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Rocker shaft shims are for correcting incorrect rocker arm to valve tip geometry not for setting lifter preload.
 
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Re: 440 Rocker shaft shims
[Re: MoparforLife]
#1194516
03/11/12 09:56 AM
03/11/12 09:56 AM
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Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
Quote:
Rocker shaft shims are for correcting incorrect rocker arm to valve tip geometry not for setting lifter preload.
I understand and agree. But is there any harm in using it for adjusting preload as long as it doesn't adversely effect valve tip geometry?
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Re: 440 Rocker shaft shims
[Re: JohnRR]
#1194517
03/11/12 11:12 AM
03/11/12 11:12 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Rocker shaft shims are for correcting incorrect rocker arm to valve tip geometry not for setting lifter preload.
But they do the trick when you have block and heads milled. As long as the rocker tip hits correct you can get by with them on a mild build. I proved it in my old 383 Dart with stock non adjustable rockers. It was done on a very tight budget and thats why I did that instead of buying adjustable rockers. It was a mild .484 cammed 383. Like I said I drove it for 7 years and ran 12.30's @ 110 with it. I only had .025 of shims under the shft as there is a limit on how much you can go without messing up rocker geometry. Ron
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Re: 440 Rocker shaft shims
[Re: bobs66440]
#1194518
03/11/12 11:13 AM
03/11/12 11:13 AM
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Joined: Aug 2005
Posts: 4,799
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
Quote:
Quote:
Rocker shaft shims are for correcting incorrect rocker arm to valve tip geometry not for setting lifter preload.
I understand and agree. But is there any harm in using it for adjusting preload as long as it doesn't adversely effect valve tip geometry?
They will effect geometry even if a small shim is used, watch what your doing. If you use to much you could put extreme side load on the guides and wear them out.
logan426
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Re: 440 Rocker shaft shims
[Re: MLR426]
#1194519
03/11/12 11:31 AM
03/11/12 11:31 AM
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Joined: Jan 2003
Posts: 10,714
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,714
North Dakota
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Back in the day, rocker shims were used frequently to decrease the stock preload on hydraulic lifters with the stock valve gear. I have an old Motion Performance handbook from the 70's that goes through the procedure for that very reason. But I agree with everyone else, like many things in life don't overdo it.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 440 Rocker shaft shims
[Re: ]
#1194522
03/11/12 09:19 PM
03/11/12 09:19 PM
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Joined: May 2006
Posts: 236
Southern CA
Colin Frolick
enthusiast
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enthusiast
Joined: May 2006
Posts: 236
Southern CA
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Quote:
- its like a mouse peeing on a ball of cotton kinda quiet-
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Re: 440 Rocker shaft shims
[Re: 6PakBee]
#1194523
03/12/12 10:04 AM
03/12/12 10:04 AM
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Joined: Aug 2005
Posts: 4,799
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
Back in the day, rocker shims were used frequently to decrease the stock preload on hydraulic lifters with the stock valve gear. I have an old Motion Performance handbook from the 70's that goes through the procedure for that very reason. But I agree with everyone else, like many things in life don't overdo it.
I agree and I have done that with a hydraulic cam.
logan426
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