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Did a cam swap on a LT1 350, cam is a hydraulic roller 218/228 .541/.541 112LSA GM Hotcam. Installed height is ~1.750" on the Isky 235D valve springs [130 seat/320 open]. Comp Stainless 1.65 rockers, .080 wall 1 piece pushrods, LS7 lifters, all brand new.
I gave the motor a few casual revs with the covers off and noticed a few valve springs/retainers spin. Takes a 7-8 hard revs to get them to make 180* of rotation. It's only happening on 3-4 cylinders, while the rest do not move that I could see.
I'm hearing/reading two different things. One that it's valve float and must be stopped. Two that valve springs can and will rotate like that and as long as it isn't excessive that it's not a problem. I guess my question would be 'what is considered excessive?'.
I'm not sure what to think. The springs are rated to .550 lift with could bind a 1.150. I tested a few of them and they are testing at what Isky rates them at, so they should be able to control the valve train right?
In my search for an answer I found a few videos like this from PAC.
http://www.youtube.com/watch?v=019Jyn9oB5k&feature=related
Thoughts?
-Dustin-
I gave the motor a few casual revs with the covers off and noticed a few valve springs/retainers spin. Takes a 7-8 hard revs to get them to make 180* of rotation. It's only happening on 3-4 cylinders, while the rest do not move that I could see.
I'm hearing/reading two different things. One that it's valve float and must be stopped. Two that valve springs can and will rotate like that and as long as it isn't excessive that it's not a problem. I guess my question would be 'what is considered excessive?'.
I'm not sure what to think. The springs are rated to .550 lift with could bind a 1.150. I tested a few of them and they are testing at what Isky rates them at, so they should be able to control the valve train right?
In my search for an answer I found a few videos like this from PAC.
http://www.youtube.com/watch?v=019Jyn9oB5k&feature=related
Thoughts?
-Dustin-