I thought the 06 and later heads are better flowing. I am talking via E-mail with a guy over east who is supplying Tman 625 cams, he speaks to the supplier and regens thats pre 06 heads give better torque when ported.  (getting the heads ported, valves and springsetc) Not sure about this. what are you experiences.

 Depends on yer budget and riding style and motor. Yer pay for wot yer get according to wot youve done with the engine.The whole thing is a package,up yer pipes,cleaner,camsTB and wotnot yer heads have to flow accordingly,stock heads will give yer just that and any more will be minimal unless yer spent the $.  HP = $ end of story. Oh, and if yer thinkin of gear driven cams, yer might wanna consider aftermarket cranks that are pin welded to a thou of acceptable tolerance ,and if yer goin that far yer might as well up the capacity as well. It never ends until youve sunk more money than tha cook should be told about.     My geezer in me avatar has so far cost me 5g, and I aint even touched me internals yet, but when I do(only done 17k so far) Ill be doing a whole heap more research to make it one hell of a donk cause it aint ever gonna be sold and engine wise Ill make it a whole lot better than the factory ever would,and dont even get me started on factory motor tolerances and deficiences of internals of late model HDs, that in itself is a whole other chapter. In short ,if yer gonna do it,do it properly and dont look for cheap ways out if yer plan on keeping yer ride for a decent amount of time

there's more meat too port with on the earlier heads because the ports are smaller too put your own shape in

You're right, the earlier heads do have smaller ports, more noticeable in the exhaust port, that is why they produce good torque down low. Those heads would require extensive porting to make them breath well with the TMan 625 cams in your build. The latter heads with a basic clean up, bigger valves & valve job, would be a better choice IMHO. - Rob

Agree with DR56 and KR.

You can do a lot more shaping with the older heads and the smaller ports "generally" promote faster air speed which will help with the torque but the newer heads are better for HP increases due to the increased volume of air it lets in.

For a mild build, small to mid range cam and all you had was small port heads, with some tweaking they would work pretty well and there are a lot of bikes running this combo with very good results. Start going into the bigger builds where the engine needs to breathe, your already half way there with the big port heads.

A good porter will be able to set up either for what you want out of your build and both types will work well but the benefits will be in different area's.

have ported & polished 4 sets of the eariler type,  had 107 ft lb  on a 95 c.i. with S/Eagle 569 lift  cam , stock modified throttle body. stock valves & pushrods

Can someone clear this up. The 103 stage 4 kit comes with cnc heads right to fit the stock 103 barrels which are 3 7/8"bore yeah. but the 110 heads on the SE motors have 4" bores. So are both heads the same? Are the 103 heads the same as the 110 heads and fit both models is the question. Thanks to anyone who knows this question.

The se pro stage 4 27517-08 Has 110+ heads
There's not much difference between a 103 + head ,acr performance Se and a 110 +head int 2.080 vs 2.125
The 103+ pro heads last appeared in 09 se cat ,the cast in screamin eagle seems to have disappered lately to
Both have big chambers
The early heads pro, mech comp releases, some none performer htcc bathtubs
Later stock heads are 7mm valve stems and the valve guides less intrusive in ports flowing better.
There's a good site with pics here

http://www.bigboyzheadporting.com/showthread.php?t=91

I was looking at new in box heads for an XB buell , & also saw some late SE sportster heads they look like one & the same just SE look to be milled to raise comp.

i know this is not related BUT the intake port has a lot more meat in the floor & looks to be like higher intake port. i was told the late TC heads have the same intake port style. appart from the very first lot of TC stock heads having a very small exhast port if you increased intake Valve & seat to anything like 2" one side of where the valve seated was very thin with not much meat & to do the job properly with the early TC heads ( do a 2.0" intake valve ) you needed to have the port floor welded up to give it enough meat on one side.

But with these late model ( i thought was 07 up? ) TC heads the ports have more meat there and fitting valve seats up to 2.0" no problem. they also flow better as they come stock on intake than the earlt TC heads, as my m8 has spent a lot of time testing on a flow bench with developing heads for himself & showed me flow numbers. they are good heads.  but i don't know about increaded Torque .but his flow good at low lifts, would depend on how your heads are done what comp you use & so on. you should contact TR. ask him dirrect

 

S/Eagle heads have the thicker 5/16" valve stems  that will take a higher lift cam & higher rev range , i would not go too a 600" lift cam  with 7 m.m. valve stems + rev her past 6,000 rpm,    with 5/16" stems we rev them too 7,500rpm no worries  all the time with bigger than 600" lift

there's nothing like a good head job