gcncsuhd
+1y
That is not entirely true. A lot of what limits the engines ability to rev is the valvetrain. A different cam profile and swapping to the mechanical rockers and better springs can go a long way into improving the ability of this engine to survive and thrive at higher rpms. Granted, it will never be a super high rev engine with the undersquare bore/stroke ratio, the Allison Legacy cars run a hopped up B2200 engine, dyno rated ~125hp, and they speed around the track all day well above the stock redline we see in our trucks, and those engines survive a couple seasons easily.