TC 103
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,147
Likes: 7,662
From: Poolville
@98hotrodfatboy If you still have those 110 cylinders, can you measure the bores down in the spigot area and see how much they're out of round?
I don't have torque plates so I don't think my measurements are accurate.. Cold sitting on the bench are as follows..
At the very bottom of the spigot the thrust side measures 4.009" and the non thrust side measures at 4.0035"
By the way they are for sale, they have approximately 5k on them and the piston valve reliefs are cut out for 2.020" intakes and 1.630" exhausts.. +3 cc domes.. I believe they are S&S..
Last edited by 98hotrodfatboy; Jun 4, 2026 at 06:55 AM.
Club Member
Joined: Apr 2011
Posts: 5,827
Likes: 7,853
From: SE Louisiana
And that's the problem with the thin spigot cylinders, they get egged, almost .006" out of round, the front cylinder is usually the one with more from what I've experienced.
@tinymike66 This is my point, with no time line, you can get your cases bored.
Get some already "seasoned" used CVO 110 cylinders on Ebay. You may have to paint them with HD texture paint if they are grey, no big deal.
Get those bored and buy new pistons.
All for near the cost of a drop on 110 kit.
Minus the thin spigots that warp.
@tinymike66 This is my point, with no time line, you can get your cases bored.
Get some already "seasoned" used CVO 110 cylinders on Ebay. You may have to paint them with HD texture paint if they are grey, no big deal.
Get those bored and buy new pistons.
All for near the cost of a drop on 110 kit.
Minus the thin spigots that warp.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,147
Likes: 7,662
From: Poolville
Again these measurements are not accurate because I don't have torque plates, so with them mounted in the cases and a top torque plate used it's very possibly you will get a different measurement than what i did on the bench. I believe the thrust side diameter will always be a little bit different and the non-thrust diameter..
OP, if by chance you do decide to Bore the cases, at that point I wouldn't even bother with the set of used 110" I go straight to brand new 117's, like I did.. You ain't going to believe the power difference. I just did a thousand foot measured run from the 110 setup to the 117 setup and gained 0.80 seconds with the 117.
OP, if by chance you do decide to Bore the cases, at that point I wouldn't even bother with the set of used 110" I go straight to brand new 117's, like I did.. You ain't going to believe the power difference. I just did a thousand foot measured run from the 110 setup to the 117 setup and gained 0.80 seconds with the 117.
Road Captain
Joined: Mar 2020
Posts: 661
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From: Sierra foothills
skip the 110
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,962
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From: poway
@Schex
I don't have torque plates so I don't think my measurements are accurate.. Cold sitting on the bench are as follows..
At the very bottom of the spigot the thrust side measures 4.009" and the non thrust side measures at 4.0035"
By the way they are for sale, they have approximately 5k on them and the piston valve reliefs are cut out for 2.020" intakes and 1.630" exhausts.. +3 cc domes.. I believe they are S&S..
I don't have torque plates so I don't think my measurements are accurate.. Cold sitting on the bench are as follows..
At the very bottom of the spigot the thrust side measures 4.009" and the non thrust side measures at 4.0035"
By the way they are for sale, they have approximately 5k on them and the piston valve reliefs are cut out for 2.020" intakes and 1.630" exhausts.. +3 cc domes.. I believe they are S&S..
BTW how long were the spigots on you 117?
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,147
Likes: 7,662
From: Poolville
One thing to note is that torque plates wont make the cylinder spigots smaller. They can do some at the base gasket but if you got 2 measurements on the outside of the spec on the spigot. If both are oversized, torque plates might bring one on a little but if so, the other will get bigger. Now, IMO, the spigots can be a little larger than the rest of the bore. All it has to do is hold the piston straight enough for it to slide back into the rest of the cylinder.
BTW how long were the spigots on you 117?
BTW how long were the spigots on you 117?
I just got off the phone with S&S and they tell me the spigot length on 4.125" cylinders is 1.850" @ .120" thickness.. I knew that they were a lot longer than my 4.0" cylinders..
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