Is it time to man up?

[65sixbanger]

So I could run more boost right?!!?

 

[fordpower21]

whats different bout the model a 6.9s that give them a lower compression ratio

 

[65sixbanger]

Well the bore and the stroke are the same.. Thats a good question...

 

[dyoung14]

that leaves pistons and heads, so its one of the 2