head advise needed

[thawk]

i have a 07 RK with bp propipe, big sucker s1, sert
i just picked up a set of wood 6-6 cams

my plan is 10-1 103" but the heads is where im stalling.
i have a friend with a set of 05 heads i can send off for porting and valves
i could buy a set of 07 heads for the work, then sell mine
or should i look for se heads and if i do which ones
i want to have the new ported heads ready to go before i tear down the motor

so would there be a difference in using 05 or 07 heads?
would i gain more from SE heads?
are the stock 07 springs ok with the 6-6 cam and plus size valves?

thanks in advance

[PanHeadRed]

$ for $ SE heads are tough to beat, but  additional mods may (most likely will) be required to reach the target 10:1 CR

The 05' castings with larger valves would be my 1st choice, but which ever casting you decide on, throw the stock valves in the dumpster.

[Hillside Motorcycle]

What Red said.
I'll also add, you'll want to get those heads motoring along around 265 cfm, and that combination will SNAP to attention, and prove to be quite a powerful build.
Scott

[prodrag1320]

we`ve found we`re getting more thru stock castings than SE heads(SE heads require about the same amount of work to get right anyway)

[aharp]

From a porter's point of view I like to work with the 06-later heads cause they don't require quite as much grinding to get the flow out of them. That said the 05-earlier heads will flow the same when done, they just need a little more material removed. Either way they both get guides at our shop. Whatever you have on hand, start there.

[thawk]

thanks guys
red the compression will be bumped with the 103 kit

what about the springs for the tw6-6 with + sive valves, use my 07 springs or buy something else?

i was once told the 07 heads flowed better but wasnt sure if that would comtinue to be true after porting or not, or just be easier to get 265cfm from them then it would be the 05 heads.

[Don D]

The flow numbers must be framed in the context of the build and your goals. What makes you think you need 265? What is the average flow of that 265 head from .050 up to say .6? Any of the castings will work well but the earlier will take more time to get them working properly so that costs more in labor. Velocity does matter and that won't be slain when the average remains high and no head tricks are done to get a high peak number at the expense of low lift flow. Remember the critical period of the intake cycle is from just before TDC to ~75°ATDC, the cam is under .300 at these parts of the motor cycle.
With that low lift cam and a strong running relatively low compression build you only need so much and then other parts become the constraint holding the build back not the heads.
Not too cool to wear 40 jeans when you take a 34. In the case of heads the higher flow models cost more too. Quality can be high and cost not too bad

[thawk]

dewy, i got the 265 from hillsides post. after that i read that the stock head flows 113 @.500 so i was going to ask if 265 was a mistake as i know nothing about what these heads do or should flow.

more questions. i was looking at SE heads and there seems to be tons of SE110 heads out there. why?

what would the performance difference be between a stock SE head and a set done by a good shop.

is there a good SE casting that out performes other SE heads?

with a good set of heads do i then need a larged TB or manifold?

sorry for all the questions but i hate doing things twice or enve worse not being happy with all my choice so i research things to death.

[Don D]

You'd be best to PM or call me
We have discussed this on here many times before and there are no new revelations since then
Briefly
The 110 heads are replaced from 2007my to 2008 on the touring bikes because they seize exhaust valves and pull the guides out of the head. Those heads have very large valves and ports and are right at home on a 117"+ motor IMO
The numbers you cite 113 and 265 are taken in two different test pressures 10" and 28" respectively and stock heads do not flow that low on the 07. I would have to look at my test data. even so if the type of riding is just normal cruising and occassionally winding it up to 4k or so the head flow numbers thing is just that a numbers chase IMO. The better heads do however flow 250 or 145 while still maintaining better than stock flow from .050 on up.
The best SE head off the shelf is none for the 103" IMO. The SE MCR head is a great piece but the chambers are too small and the compression would be too high for most builds such as you're contemplating. Open the chambers up a little and now we have a new story. Those are nice heads. All of that said so are your stock heads with a little rework.

[Hillside Motorcycle]

dewy, i got the 265 from hillsides post. after that i read that the stock head flows 113 @.500 so i was going to ask if 265 was a mistake as i know nothing about what these heads do or should flow.

more questions. i was looking at SE heads and there seems to be tons of SE110 heads out there. why?

what would the performance difference be between a stock SE head and a set done by a good shop.

is there a good SE casting that out performes other SE heads?

with a good set of heads do i then need a larged TB or manifold?

sorry for all the questions but i hate doing things twice or enve worse not being happy with all my choice so i research things to death.

The 113 cfm you are refering to is, without a doubt, measured at 10".
To compare at 10", then that boils down to 158-160.
Yes indeed, you want/need that head to start really pulling at .100 lift and build by leaps and bounds as you reach .200", etc, etc, etc, to get the cylinder filling to occur asap.
Another point is, to have both heads rolling within a few percentile of one another, from .100"-peak lift testing.
Scott

[PanHeadRed]

>07 springs<

Throw them in the dumpster as well.


>easier to get 265cfm<

Ain't noth'n eazy about 265 CFM but it sounds like a good targeted CFM, with a 195 -200 average. (just in case you were wondering).

[Don D]

28" is a defacto standard started by Smokey Yunick and the higher pressure will uncover issues not seen at lower pressures. I go higher at times for my own purposes, not published.
According to him significant changes in port sizing and configuration failed to produce measurable results if the depression was less then 28"/hg. and anything greater then that was still consistent with data gathered at 28"/hg setting.

[mayor]

why would someone advertise 28" flow numbers if the machine(superflow 110) works at 10"??

not everyone uses a Superflow 110, and as long the inches is listed one can easily compare using conversion charts.  Most use 28" as a standard, not all flow benches pull that. 

[Don D]

You can use math and convert

[aharp]

Sometimes it's not always what the head flows but HOW it flows it.

[prodrag1320]

very true,big peak #`s are going to make HP #`s at peak rpm`s,but nothing on the bottom,we like big #`s from .100 up, while keeping volocity high thru out the entire range up to .600 on street heads.we also like the earlier TC heads,while it takes more work,theres more material to work with to get a port exactly the way we want it,alot easier to take material out than to be restricted by not having the the material there to conture a nice port

[Don D]

Well said Aaron
I am OK with any of the heads, just treat them differently

[Hillside Motorcycle]

Sometimes it's not always what the head flows but HOW it flows it.

That is what my brother Craig, and you, have discussed on several occasions.
Scott