S & S lifter cuff compatibility
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Seasoned HDF Member
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From: Ottawa, Ontario
Originally Posted by NorthWestern
I have not seen any reports of failures related to someone installing the S&S cuffs without the required clearance (use of feeler gauge when torquing fastener)
Has anyone seen or heard anything about binding related to this?
Has anyone seen or heard anything about binding related to this?
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Joined: Apr 2016
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From: Inland NW
S&S states in their installation instructions you need to shim...
Attachment 630575Attachment 630574
Attachment 630575Attachment 630574
I was curious if anybody had heard of, or seen what happens when this procedure is not followed.
HD EFI Guru
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Whats going to happen and does happen, is the steel lifter wears the softer anodized Aluminum plate. Guide plates like these have been used for years by the OEM's, except, that they make them out of steel and they are held in place by a spring which allows the to float with the lifters but does NOT allow the lifter to twist in the bore.
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From: Niles Canyon Ca.
I wasn't saying they never fail, but I can tell if anyone on this forum experiences something negative with their Harley, it gets covered. If it is common, like the transfer of oil from the transmission to the primary, there will be hundreds or thousands of posts. The early M8 sumping issue was another one that was fully covered. The failure of the plastic cuffs has probably been brought up, but it is rare enough that there weren't numerous posts making it a commonly talked about issue. Maybe it is because S&S has offered the aluminum guides since the early in the life of the M8, so the solution was easily available. I would say I remember the S&S cuffs were offered well before any plastic cuffs had the opportunity to fail.
I did Google the plastic cuffs in Chevrolets, the Corvette forum did make some mention of them failing at times. It didn't seem to be a common issue with them either.
Harley does things at times that I find baffling. The pin to me seems to be a really good solution to the rotation of the lifters, yet it was abandoned in the M8 and the plastic cuffs were implemented. I am sure when they are designing a new engine there are cost considerations, maybe the cuffs are significantly less expensive. Also, since there are 17 years between the TwinCam release and the M8, I am sure many of the developers of the TwinCam probably weren't still around when the M8 was being conceived. All in all though, the M8 has turned out to be good engine that is easy to enlarge if that is your desire. Roussfam, best of luck with your build.
I did Google the plastic cuffs in Chevrolets, the Corvette forum did make some mention of them failing at times. It didn't seem to be a common issue with them either.
Harley does things at times that I find baffling. The pin to me seems to be a really good solution to the rotation of the lifters, yet it was abandoned in the M8 and the plastic cuffs were implemented. I am sure when they are designing a new engine there are cost considerations, maybe the cuffs are significantly less expensive. Also, since there are 17 years between the TwinCam release and the M8, I am sure many of the developers of the TwinCam probably weren't still around when the M8 was being conceived. All in all though, the M8 has turned out to be good engine that is easy to enlarge if that is your desire. Roussfam, best of luck with your build.
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From: Ottawa, Ontario
Just found this, thought I would share...
...Once we have the cam chest disassembled we use a heat gun to heat the engine case from the inner camchest side (as shown in the image below), it only takes about 5 minutes of heat and the bolt's screw out with ease...
...Once we have the cam chest disassembled we use a heat gun to heat the engine case from the inner camchest side (as shown in the image below), it only takes about 5 minutes of heat and the bolt's screw out with ease...
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