Hi guys and girls, as the title states I have turned my Milwaukee 8107 Street Bob and two of one 19 in.³ stage three. I absolutely love it beautiful smooth power. My question is if I change the top end and the throttlebody does that which I guess is a stage four does that automatically change it into the 128 or is that just the 119 with a Top end build being a stage 4. Any insight would be greatly Appreciated.

 

I guess it’s kind of a silly question. The more I think about it I suppose you would have to have bigger cylinders.

 

I'm sorry but I haven't been able to determine what you're saying here?

 

Same capacity but with heads you're after more flow or a little more or less compression ie whatever the cam works best with.

 

You can’t change a 107 into a 128 on cylinders, pistons etc alone. The 107 goes up to a 124 max I believe, due to its shorter stroke than a 114. Your motor will still be 119 just with an upgraded throttle body and anything else you choose to throw on it

 

Fully agree with this statement.

 

For the 107" motors, screaming eagle has a 119 stage 3 kit, and also the 128 stage 4 kit.
all bolt on.
the stage 4 128 includes cnc heads and 64mm throttlebody.
the 114 motor has a 122 kit and the stage 4 131 kit.

Just doing throttlebody and heads won't make it a 128.
If you are looking for more power just bite the bullet and get the stage 4 131" crate engine and save the time. Big bucks though to the tune of 6500 bucks..

 

hey whats a 8107 any way?? first time i have herd of this

 

Apologies. Into a 119 in.³ build.
I sometimes talk text, and make the mistake of not proofreading.

 

Milwaukee eight, 107 Cubic inch-engine
Cubic inch