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post #1 of 19 (permalink) Old 02-23-2016, 08:25 AM Thread Starter
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103 to 107

Is 4 extra cubes worth it? If I was putting a 400 crank in a 350 block I'd say 30 extra cubes is worth the time and money but 4? Does it really make much of a difference? I currently have my motor apart and have to replace the Orings at the bottom of the cylinders so I'm thinking an overbore and pistons/rings may be in order. I almost have 50k on my bike and I am surprised to see the original ball hone marks in my cylinders. Is this normal? I also had what I felt was an excess of carbon build up on the tops of my pistons. I felt I had a good running motor but with all that carbon I can understand why I had some detonation issues on hot days. The carbon is gone. I cleaned them off. I plan on routing my breathers to a catch can rather dumping into the intake again so I hope that helps the carbon issue.

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post #2 of 19 (permalink) Old 02-23-2016, 08:36 AM
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Is 4 extra cubes worth it? If I was putting a 400 crank in a 350 block I'd say 30 extra cubes is worth the time and money but 4? Does it really make much of a difference? I currently have my motor apart and have to replace the Orings at the bottom of the cylinders so I'm thinking an overbore and pistons/rings may be in order. I almost have 50k on my bike and I am surprised to see the original ball hone marks in my cylinders. Is this normal? I also had what I felt was an excess of carbon build up on the tops of my pistons. I felt I had a good running motor but with all that carbon I can understand why I had some detonation issues on hot days. The carbon is gone. I cleaned them off. I plan on routing my breathers to a catch can rather dumping into the intake again so I hope that helps the carbon issue.
If everything remains the same then no, not really. But going to a 107" with all the right components that work right together the 107" will be well worth the investment. The key is that ALL of the ingredients in the soup compliment one another and it will be the best tasting soup you've ever had. Many choices out there so try and buy most of the ingredients from the same builder that has a proven recipe. I have run with a couple of 107" builds that Kevin Baxter did at Pro Twin Performance and all I can say is WOW! I know there are some other great choices out there but he sells the components and they are 2nd to none and built to last. Especially if you do his bottom end work. Just my 2 pennies.... Good luck!

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post #3 of 19 (permalink) Old 02-23-2016, 08:48 AM
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Routing to a catch can definitely will help. That + a good tune even better. Personally I would spend my dollars on the heads. Sheffer Performance got 110hp/118tq on a 103" with headwork by Dan Vance Racing, CR575 cams and a good pipe. Compression is not that high. CCC is about 190psi. Best Wishes on your build.
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post #4 of 19 (permalink) Old 02-23-2016, 08:54 AM
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Depends who you ask. If you have it apart then why not, I'm very pleased with my 107". Other things go into it, head work, cams, good exhaust etc. And a good tune is always recommended.
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post #5 of 19 (permalink) Old 02-23-2016, 08:58 AM
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Originally Posted by BigNorm View Post
Is 4 extra cubes worth it? If I was putting a 400 crank in a 350 block I'd say 30 extra cubes is worth the time and money but 4? Does it really make much of a difference? I currently have my motor apart and have to replace the Orings at the bottom of the cylinders so I'm thinking an overbore and pistons/rings may be in order. I almost have 50k on my bike and I am surprised to see the original ball hone marks in my cylinders. Is this normal? I also had what I felt was an excess of carbon build up on the tops of my pistons. I felt I had a good running motor but with all that carbon I can understand why I had some detonation issues on hot days. The carbon is gone. I cleaned them off. I plan on routing my breathers to a catch can rather dumping into the intake again so I hope that helps the carbon issue.
Norm, the reason you have the build up on the pistons is the way Harley runs their breather tubes into the breather box and then drawn into the intake. It's easy to reroute these without much effort and is so much better on your top end while giving you a little increase in power.

On the 107, it is one of those size engines that just work with the right combination. Something just gels when you go with 107. With the heads you are doing, flat top pistons, and the S&S 585 cam with stock throttle bodies and injectors, I've been seeing over 120 hp and 120 tq. easily. I was just talking with a couple of noted engine builders in our area about this motor and combination. It is also a build that is good for the long haul and doesn't beat itself up over time. Very reliable. They like to set the compression at about 10:2-1 and good to go. Call me some time and we will talk.

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post #6 of 19 (permalink) Old 02-24-2016, 05:43 AM
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Quote:
Originally Posted by BigNorm View Post
Is 4 extra cubes worth it? If I was putting a 400 crank in a 350 block I'd say 30 extra cubes is worth the time and money but 4? Does it really make much of a difference? I currently have my motor apart and have to replace the Orings at the bottom of the cylinders so I'm thinking an overbore and pistons/rings may be in order. I almost have 50k on my bike and I am surprised to see the original ball hone marks in my cylinders. Is this normal? I also had what I felt was an excess of carbon build up on the tops of my pistons. I felt I had a good running motor but with all that carbon I can understand why I had some detonation issues on hot days. The carbon is gone. I cleaned them off. I plan on routing my breathers to a catch can rather dumping into the intake again so I hope that helps the carbon issue.
It depends on how much you are going to end up spending and how much power you want. Boring the jugs and a "street port" on the heads will be worth it since it is apart. If you are going to put some real money in the head work then no, I wouldn't do a 107". I would do a 124" LC kit on your cases and be done with it.

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post #7 of 19 (permalink) Old 02-24-2016, 06:42 AM
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107" engines can be quite potent, no doubt.
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post #8 of 19 (permalink) Old 02-24-2016, 06:50 AM
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Depends who you ask. If you have it apart then why not, I'm very pleased with my 107". Other things go into it, head work, cams, good exhaust etc. And a good tune is always recommended.
I am very happy with my 107 build. As others have said, talk to a builder and get a combination of parts that work together well.


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post #9 of 19 (permalink) Old 02-24-2016, 08:19 AM Thread Starter
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How much does a good set of pistons go for. I want them to clear the 190 valve if I decide to go with more lift in the future. Does anyone know of a good machine shop in California or NV? I'm glad Kirby is doing my heads but it cost me 50 to ship them across the country and I'm sure it will be around the same to ship them back. Maybe USPS would be cheaper. I'll see if it's an option.

2011 Road Glide Ultra, Andrews 57H, VeeTwin Performance street port, Big Sucker Intake, Rhinehart 2/1 w 4" muffler, Power commander V, Paugcho 17" bars, Stock seat recovered with leather, Michelin Comander II 140/80B front, Yokohama Envigor 205/60/16 rear. It's better on the dark side.
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post #10 of 19 (permalink) Old 02-24-2016, 08:46 AM
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How much does a good set of pistons go for. I want them to clear the 190 valve if I decide to go with more lift in the future. Does anyone know of a good machine shop in California or NV? I'm glad Kirby is doing my heads but it cost me 50 to ship them across the country and I'm sure it will be around the same to ship them back. Maybe USPS would be cheaper. I'll see if it's an option.
Buy shore pistons online and have them ship them to Kirby to clearance the valve relief. Then Kirby will ship them back to you with the heads. Bingo.

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