hey guys,

if i was getting to 107bore and heads flowed and i have a 96ci motor can i use 103 barrels and heads?

 bit of background

i have a 2009 fxstb

i want minimal off the road time so would i be able to use a set of 103 heads and barrels to off of 2013 street bob to get bored to 107 this work would  also include cams heads flowed push rod pistons ect.

please help as i am not up with the know how in this area

thanks in advance.

Yes you can use 103 barrels and heads. 103 heads came with automatic compression release (acr) valves and loom which is a bonus if you have them, the loom and can activate acr with a decent tuner. This is a good feature if you run compression above 9.6 which could wear out your starter. The only other diff is that the dyna/touring or rubber mounted "a" version of the heads have a slightly diff mounting setup to the softail b motor's head's. But this can be worked around.

A decent engine builder will be all over it. As for piston choice, compression, squish, head porting, valves, cams, push rods etc, there are too many variables.  Choose a reputable engine builder, tell them what you want and trust they will know which package of parts will work for your objectives and budget. I reckon the s&s big bore kits are pretty good value but will still need checking over by a machinist. 

thanks for the reply some great info here. whats the go with the mounting of the heads -looks like i have found a set from a mates 2013 streetbob- 96 which suits me fine with the 2009 train (i think) is there any diff in what you are talking here?
cheers jonesy

The 96 heads wont have the auto decompresses, which is nice to have but can be worked around. Either put manual de-comps in if you are going to run a bit of compression, or use the S&S easy start cams which are nice.