I'm shopping for a new engine and see that axial .28 seems to be a good bet. what's the difference in the green head and grey head and which is better?

ther both exactly the same. just the heads are different color.

ok , my bad, the real question is the axial .28RR (shown in green) and the axial .28 (shown in grey)

Axial .28 RR will have more power and looks 100 times better.

-Josh-

The axial .28 green head is the same as the gray head!

The axial .28rr is a more powerful engine!