Overclocking to a very aggressive value fries your processor. Also as said above, you get less battery life & the device heats up. Sometimes it is not the values but what you get out of the values matters. I recommend not to overclock above 900 MHz. Btw, to answer your question, there's a kernel called the mad kernel ( donno if it still exists , Google to find it) made by madman. I donno if it supports stock or cm7, you'll have look for it yourself.
Sent from my GT-S5830 using xda premium