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Shimming Rockers #695727
05/12/10 11:33 AM
05/12/10 11:33 AM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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Is it normal on most roller rockers that they require shims to keep them centered over the valve stem? Are their rockers available that have the precision to not require this? And if so which ones? Thanks.

Re: Shimming Rockers [Re: Wolfe440] #695728
05/12/10 11:44 AM
05/12/10 11:44 AM
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JohnRR Offline
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What rockers do you have , or do you plan on buying ? There is going to be a spacer between each pair of rockers , shims may or may not be required to make the alignment correct.

Re: Shimming Rockers [Re: JohnRR] #695729
05/12/10 11:48 AM
05/12/10 11:48 AM
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Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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The rockers I have are Cat and going straight in the garbage. I'm shopping around and would like to bolt on, adjust, and not go through the shimming I had to do with the ones I took off.

Re: Shimming Rockers [Re: Wolfe440] #695730
05/12/10 11:51 AM
05/12/10 11:51 AM
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detroit, mi
POS Dakota Offline
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Anytime you have a custom engine with milling on heads and block etc, you will have to shim the rockers to achieve proper geometry.

Re: Shimming Rockers [Re: Wolfe440] #695731
05/12/10 11:52 AM
05/12/10 11:52 AM
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JohnRR Offline
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You are lucky that those POS rockers didn't come apart .

Get the comp pro magnums

Re: Shimming Rockers [Re: JohnRR] #695732
05/12/10 12:00 PM
05/12/10 12:00 PM
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New Mexico
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dmerc Offline
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Quote:

You are lucky that those POS rockers didn't come apart .

Get the comp pro magnums




I've got a brand new set of those and I just can't bring myself to throw them away. But I should.

Re: Shimming Rockers [Re: JohnRR] #695733
05/12/10 12:00 PM
05/12/10 12:00 PM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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That's what I'm hearing. I been looking at the pro comp and its top of my choices. I'm ready to spend some coin. From the info so far I see shimming is inescapable. I was also considering Hughes. Are they worthy?

Re: Shimming Rockers [Re: POS Dakota] #695734
05/12/10 12:10 PM
05/12/10 12:10 PM
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JohnRR Offline
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Quote:

Anytime you have a custom engine with milling on heads and block etc, you will have to shim the rockers to achieve proper geometry.




WRONG, cutting the heads and the block does NOTHING to valve to rocker GEOMETRY , you have to cut the ROCKER STANDS to affect that.

Shimming rocker shafts because of aggressive head and block milling is the WRONG way to correct for the problem created which is PUSHRODS that are now TOO LONG ...

The shimming the OP is talking about is shimming BETWEEN the rockers to center the rocker tips on the valve stems .

Re: Shimming Rockers [Re: JohnRR] #695735
05/12/10 12:16 PM
05/12/10 12:16 PM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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I would have to agree with that. And in my case the block deck is stock, and the heads are Edelbrock never shaved. The Cats had .50+ left to right slop, I was hoping to purchase some new ones where that does not need to be addressed.

Re: Shimming Rockers [Re: Wolfe440] #695736
05/12/10 12:25 PM
05/12/10 12:25 PM
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Manitoba, Canada
DaytonaTurbo Offline
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What cam are you running?

Re: Shimming Rockers [Re: DaytonaTurbo] #695737
05/12/10 12:26 PM
05/12/10 12:26 PM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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564/257. Its a 440 source stroker to 528 bottom end.

Re: Shimming Rockers [Re: Wolfe440] #695738
05/12/10 12:35 PM
05/12/10 12:35 PM
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Ontario.Canada
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can.al Offline
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Ontario.Canada
..a 1/2" slop?
..Crane tech recomend you shim to .013 clearance

Re: Shimming Rockers [Re: can.al] #695739
05/12/10 12:39 PM
05/12/10 12:39 PM
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Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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Sorry, .050 slop. I have it down to approx .015 with shims galore.
What about Hughes, I have been hearing good things?

Re: Shimming Rockers [Re: Wolfe440] #695740
05/12/10 12:46 PM
05/12/10 12:46 PM
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Ontario.Canada
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can.al Offline
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...O.K. now that they are correctly shimmed, what is the problem?

Re: Shimming Rockers [Re: can.al] #695741
05/12/10 12:49 PM
05/12/10 12:49 PM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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I'm ready to trash the cat rockers. I was looking to make a upgrade. I was wondering if any rockers were offered that were precision enough to not need shimming.

Re: Shimming Rockers [Re: Wolfe440] #695742
05/12/10 12:56 PM
05/12/10 12:56 PM
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Ontario.Canada
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can.al Offline
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..i have an older set of Crane Gold 1.5 and originally assembled them without shims.there is some slop and they are a little noisy.
.i don't think it matters for normal driving..it's just annoying.
i recently got a quantity of shims from Crane and wonder if installing them will make them a little quieter?

Re: Shimming Rockers [Re: can.al] #695743
05/12/10 01:04 PM
05/12/10 01:04 PM
Joined: Feb 2007
Posts: 214
New Port Richey, Florida
Wolfe440 Offline OP
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The noise of the cats is why I hate them, shimming helped. Also the tubes the push rods travel through the Edelbrock heads is not exactly generous. I was either rubbing or it looked very close until I shimmed. I just wondered if the finer of rockers made out there fit without shimming the slop.

Re: Shimming Rockers [Re: Wolfe440] #695744
05/12/10 01:14 PM
05/12/10 01:14 PM
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Ontario.Canada
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can.al Offline
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..thanks Wolf,that's what i was wondering.
..i have heard that all roller rockers are a little noisy...say 'kinda like a sewing machine..
hope some other guys will chime in on this...

Re: Shimming Rockers [Re: Wolfe440] #695745
05/23/10 10:42 PM
05/23/10 10:42 PM
Joined: Feb 2009
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Ontario.Canada
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can.al Offline
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Ontario.Canada
bump

Re: Shimming Rockers [Re: can.al] #695746
05/23/10 10:57 PM
05/23/10 10:57 PM
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Posts: 7,664
IN
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ahy Offline
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Shims on the shaft are normally necessary with custom parts (rockers, holddowns ect.) to line up the rockers and valve stem heads. I had to do it and lots of others have as well.

That said, there are good reasons not to use the cat rockers from what I've heard. The "pro magnums" sound like a good choice.

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