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[wnogood]

Does anyone know what the chamber volume is on the 2006 Se 103 heads is? What size throttle body? Are the pistons dish or flat top? Trying to decide what I have and where I want to go......

Thanks....

[cherryseeg2]

Appox. 95cc, 46mm, flat tops.

[wnogood]

Thanks cherry. Are these heads a good starting point for port and polish or are there better  options out there?  That seems like an awful lot of chamber volume compared to some of the others out there

[prodrag1320]

their as good as any for a starting point,im not remembering the chamber being that big though

[wnogood]

I do know that the compression on these bikes is absolutely sad. Someone said it's right  around 9:1 with flat top pistons, it would make sense that the chambers would have to be what is lowering the compression. I guess if performance is the goal, a head milling will be in order!

[HD Street Performance]

They work well with mods, have the same ports as the old SE MCR head which have a lot of meat and room for bigger valves. They are 98cc nominal. All pistons are discontinued for the 103 with domes but most of the time with a healthy mill they can be brought up to what is needed to get the job done. I know of a few pistons that will work if a dome is needed.
Anyone that goes down they "no squish" road doesn't understand how to get them to work, I hear that a lot, "no squish area they are junk". The 103+ is better yet with a wide open chamber but closer to the HTTC.

[wnogood]

They work well with mods, have the same ports as the old SE MCR head which have a lot of meat and room for bigger valves. They are 98cc nominal. All pistons are discontinued for the 103 with domes but most of the time with a healthy mill they can be brought up to what is needed to get the job done. I know of a few pistons that will work if a dome is needed.
Anyone that goes down they "no squish" road doesn't understand how to get them to work, I hear that a lot, "no squish area they are junk". The 103+ is better yet with a wide open chamber but closer to the HTTC.

I guess my next question would be, is this a good head to start with or would I be better off trying to start with something else? I don't mind picking up a set and having them ported so I can reduce down time if my heads are not a great candidate to start with

[Razorback]

How's this for a great candidate for making power, these were re-worked by Don (Deweys heads) and worked great on this build.

[wnogood]

Well now, that's a 120" if I read that right. I'm never gonna be more than a 107". So have you got an example of one of those?

[HD Street Performance]

Closest I can find is this one a 113" Low compression, 185CCP
The 103-107 will still be a very fine performer with those heads, they can scale back easily.

[wnogood]

Closest I can find is this one a 113" Low compression, 185CCP
The 103-107 will still be a very fine performer with those heads, they can scale back easily.

Please tell me that dyno sheet indicates 48 cams.... That's what I'm running now!

[Twolanerider]

Just read a PM with a link to this thread saying to talk up a 107" build.  You can make a really nice 107" build if one is so inclined without tremendous amounts of work.

My favorite was the one in the old red bike.  Axtell's jugs and pistons with a set of CNC HTCC heads that had been touched up by them with Dave Mackie's 598 cams in mind.  50mm tb, rollers and Fatcats.  CR was about 10.25:1.  Dyno numbers are variable but that engine was at least high one-teens on the torque side.  Came in well by 2800 and pulled hard at least through 4500.  That was a great build and fun to ride.

[HILLSIDECYCLE.COM]

A well thought out/well built 107"er can be quite formidable.
Scott

[hogasm]

That 103 is a great platform to start with. With stock pistons...deck heads 55-60k to achieve 10:1 compression, new valves a little massaging and run a S&S570. You can run the stock tb or send it off to Revolution Performance to have it bored out to 50mm...nice build for a touring bike that you want to be reliable and last a long time

I believe that John Sachs  has some Arias pistons 10 over for that motor. Give him a PM

But

No matter what you decide...discuss it with a reputable builder to help accomplish exactly what you want

[wnogood]

Only one minor issue, I'm running the hybrid cam plate so I am restricted to the Andrews 'n' cams. I love my 48's, but they work with lower compression. Ideas?