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Old 08-10-2008, 04:36 PM
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Changing valve springs zz4 hot cam

I have never changed valves springs while the head is on the engine
I have read that you use air pressure to hold the valves in place
But what happens if you break the seal the valve will fall in to the cylinder
So is there any other way to change the valves while the head is on the engine
Have any of you all done the hot cam on your zz4 how much trouble was it to change the valve springs on the engine
Thanks for any help

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Old 08-10-2008, 04:40 PM
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I use the rope technique. Take a small diameter rope, get the cylinder half way down on top dead center, fill the cylinder with rope through the spark plug hole, then move the piston up until you feel it stop. After you change the springs move the piston back down and remove the rope. I would use the springs GM or whatever given cam company recommends for that cam. Keep in mind you cannot use flat tappet springs on a roller cam.
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Old 08-10-2008, 05:08 PM
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The rope sounds like a good idea
Could you tell a difference after the swap
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Old 08-12-2008, 12:55 AM
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Unless your ZZ4's valve springs have gone bad, you might just save yourself some trouble. The ZZ4 engine and the LT4 Hot cam kit use the same valve springs, pn 12551483.
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