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[Anastasia_05]

fellas I'm looking to do a build on my 103.  Its built decent right now it makes 109 HP and 113 foot pounds.  It runs well.  More is always better in my book.  Im looking into big bore kits.  I was wondering what is the best bang for my buck is.  I seen 124 kits up to 131 kits if I'm correct.  what do all you recommend?  I still want it some what streetable as well.  what kind of power do some of this kits make?  If any one has a complete lists with line items so I can do a little research on these on products that would be much appreciated.  Any information is GOOD information thanks again. 

Brandon.

[MCE]

I've had great results with S&S' 110 kits. 127/127 was the lowest one so far. 129/130 is typical
with my heads and a good pipe. One of these has close to 30,000 miles on it and still runs strong.

that one made 129/129. The sheet is on my website, and there's another one on MCE Performance
FB page.

You have to bore your cases to go any bigger than 110. I start with the stock 103 heads and work
them over heavily, custom made Manley valves and Manley's springs, I've had great results with
all of them. fyi....

[MCE]

Properly done, the 103 ACR heads work extremely well on larger than 110 too.
Over 120CI the SE110 heads are a good place to start. But they're really too big
for a 110 that's not going to be spinning above 6000 on a regular basis.

The SE110s need even larger valves put in them to get them to work right. The
throats are just too damn big in stock form. IDK what Harley was thinking when
they did that. 

[HD Street Performance]

It is easy to just do the heads cam and throttle body. Even my cheapie heads will get you 120 sq or close. Stock bottom end

[MCE]

fellas I'm looking to do a build on my 103.  Its built decent right now it makes 109 HP and 113 foot pounds.  It runs well.  More is always better in my book.  Im looking into big bore kits.  I was wondering what is the best bang for my buck is.  I seen 124 kits up to 131 kits if I'm correct.  what do all you recommend?  I still want it some what streetable as well.  what kind of power do some of this kits make?  If any one has a complete lists with line items so I can do a little research on these on products that would be much appreciated.  Any information is GOOD information thanks again. 

Brandon.

124 kits making 131 is nothing to write home about. I've been getting 130/130 out of 110 drop ons. Using re-worked 103 heads.

A 124ci a should put out north of 140 square.
 

[MCE]

You should be pretty close to 120/120 now (with 103ci) (If the heads are half-way decent).
If your heads are stock, I'd say you're doing pretty well.

[HD Street Performance]

Matt notice a trend? Guys buy groups of parts above and beyond the stage the hd stage kits results are the same or less. Then this is tried to be molded into the new normal.  Look at the hp/ cu. in.

[HD Street Performance]

So a 103 with stock heads makes 120?

[skratch]

124 kits making 131 is nothing to write home about.

i do believe he was talking about 124ci to 131ci.  not a 124 making 131....

[MCE]

i do believe he was talking about 124ci to 131ci.  not a 124 making 131....

Yeah, I see that now. My bad, misread it. (I'm trying to do 5 things at once)

I'm saying a 103 with a decent combination of parts and tune should be close to 120
Like high teens.

There's no mention of real specifics besides "its built decent". 109/113 is not horrible
but I have no idea what all has been done to get to that point.

[HD Street Performance]

'm saying a 103 with a decent combination of parts and tune should be close to 120 
Like high teens

Matt, and that is without head work?

[Twolanerider]

103 can get their (or a bit more) with head work.  I didn't try it without. 

The 103 in my old 05 was built around Mackie 598 cams.  107 in build with those cams and some nice head work.  On different machines (one I knew and trusted one was a normal "oh we're at a rally let's waste $40 and loser buys the beer) had comparable numbers.  It was in to the low 120s but would suffer slight bit of detonation in really hot weather.  Just because I'm impatient with such nonsense had a little timing out and it ran reliably and really well running in the high 1-teens.  Would do that all day long and did so on long trips and a couple thousand mile days.  Man I liked that bike  .

[HD Street Performance]

Ok so we are getting closer to reality..
05 5 sp bike, less drag than a 6 sp bike
250deg cam, healthy. I am sure there was a head package with that build that was not of the budget variety. And also sure there was a healthy amount of compression to get there and a larger TB likely.

[TraumaSlave]

https://www.cvoharley.com/smf/index.php?topic=115440.msg1463549#msg1463549

Here is my build. I can't say enough about it. Whole new bike.

[Twolanerider]

Ok so we are getting closer to reality..
05 5 sp bike, less drag than a 6 sp bike
250deg cam, healthy. I am sure there was a head package with that build that was not of the budget variety. And also sure there was a healthy amount of compression to get there and a larger TB likely.

Definitely so.  Would never have gotten where it did without it.  Some nice head work.  Best amateur's math had it in at about 10.25:1.  Only a 50mm TB though.  Didn't want to start trading bottom end for top end.