So I am in the planning stages for a budget 107 build on my '10 FLHTK.
I would like some input on the component selection as well as overall combo.
I already have a FuelMoto air cleaner, SE 255 cams, Power Vision, and D&D slip-ons.
I intend to retain what I already have and use the following for the 107 build.

Hylift-Johnson 2313SE Lifters
Cometic 4.060 .040 thick head gasket
Big Boyz ported heads
Jackpot ceramic coated head pipe and stainless full size crossunder. (Budget allowing)
AMS Moto big bore pistons and cylinder boring (KB pistons, Hastings rings).

I understand I am going to have to be careful about cranking compression.
Big Boyz calculator comes up with 208 psi with a 0 deck.
Is this pushing it? I believe the pistons can tolerate some machine work to reduce compression if required. I know FM gives this option with their CP pistons.

Please let me know your thoughts.

 

Check your crank run-out before you get to deep into this build....

Last thing you want to do IMO is put more pressure on a crank with run-out issues.

If more than .003" run-out, reconsider your strategy.

 

I'm not doing gear driven cams so I don't think i need to hold to the .003 runout spec. I do know that HD's published .012 is a bit much.
I will check it and if it is excessive I will regroup.

 

the 255's aren't a good choice of cam for 107!! I'd strongly suggest looking at a cam with an intake close of 40* or later.

 

I agree. Doing a 107 build and headwork for 255 cams does not make sense at all.

 

As long as I keep static compression down, what is the issue with the 255?

 

In a 107" touring build, an Andrews 57, or CR .575 would be better choices than that emission-oriented 255.
Scott

 

the 255 is a stock trade up, low compression cam and will fall flat on it's face way before 5k. No sense in doing heads if your gonna use that cam. With chain drive you will be fine and yes the moco upped the run out to .012"... 208 ccp is very high and you will have problems tuning the motor with the 255. As said a cam with 38-42* will suite the build good and will carry out a lot further... A woods TW-7H would be a good cam for that build with real good low and mid torque but will still carry up over 5500 rpm set at 10.0-10.2:1 COMP.... But most are using the Andrews 57 cam....

 

I agree with Scott, but you really need something more than BB street port heads. While the BB heads might hit 240 cfm at 28 in H20. they are not flowed. You rally should get heads that flow 260+.. Do it right the first time.. You could use the BB head, and squeeze it to 10.5 and use a later close cam like the Andrews 55 but you seem to be compressionally challenged. 10 to 1 107 with better heads is more popular.

Make sure you have a reasonably good tuner to tune the bike.

 

If using KB pistons make sure they are forged and not cast..