They were on the head already with after market springs, I installed new crane springs and the tops do not interfere with the rockers and they are no thicker than the originals at least where they contact the springs. The new springs I installed are considerable stiffer then the one I removed though. I installed a new crane cam kit, will use new push rods lifters etc... After the breakin I will install the second inner springs.
Are those Crane springs installed at the correct height and have the correct seat and open loads? Those things plus verifying coil bind will not occur should always be checked when installing new springs. Is the inner spring you left out during break in a flat wire damper or do you have double springs? Double springs are usually too strong for hydraulic flat tappet cams. A flat wire damper doesn't increase the spring rate much and is typically left installed during break in.
One important issue during break in on flat tappet cams is to use the correct break in oil. Todays conventional and synthetic oils are not sufficient for flat tappet cams.
Mike, great points. I found this article at the comp cams site which I referred to in the past. I think it will provide a good visual and how to in regards to your points:
I glanced over that article. It's a pretty good article. Right off the top I've heard of item 3 in selecting a spring occuring. The spring dancing around on the cylinder head and occasionally touching the valve seal and lifting it off the guide.
If his Crane springs were a recommended drop in replacement the he is probably fine as they are. If not, those items should definitely be checked.
Yes, all parts came with the kit from crane and I measured the springs vs the old ones still on the head and all are the same height. The springs are stiffer to help eliminate valve float at high rpm from what I have read.
If they are to be installed at the same height as your old springs everything is probably fine. Otherwise the installed height is adjusted with shims below the spring or different retainers or different locks. Seat load, open load and no coil bind at max lift are more critical then matching the height with the old springs.
As a safety measure new retainers and locks are replaced when new springs are installed. This is especially important when installing stronger springs. I'm actually shocked Crane didn't suggest new retainers and locks.
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