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                         ALL YOU WANT TO KNOW.....!

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Milling the gasket layer on the heads is a good way to get more power, though you'll probably want to get someone that knows what they're doing to do it. Basically you want to get the piston to come very close to the flatter part of the heads (the squish band) to push the mixture to the center for a more centralized burn. This is a sure-shot way to achieve more power as it contributes to a considerable increase in the compression ratio. 

However I would suggest this mod mostly on the Indian LTs, the reason being, the huge step which was provided on the gasket layer which caused a considerable drop in compression. This was one amongst the many differences between the HTs and the LTs which were launched in India. While the HTs had a step of 1mm on the gasket layer, the LTs had a step of about 2.5mm. Milling this down to 1mm should be good enough.

However, remember one thing, if you get too radical with this, especially on the LTs, there is a good chance that you may very well burn a hole in your piston. Radical milling should be accompanied with advancing the outlets to compensate for the raised compression.

Cylinder heads can be reshaped to change the power band. Generally speaking, a cylinder head with a small diameter and deep combustion chamber, and a wide squish band (60% of the bore area). Combined with a compression ratio of 9 to 1 is ideally suited for low to mid range power. A cylinder head with a wide shallow chamber and a narrow squish band (35-45% of bore area) and a compression ratio of 8 to 1, is ideally suited for high rpm power.

There are many reasons why a particular head design works for certain types of racing. For example; a head with a wide squish band and a high compression ratio will generate high turbulence in the combustion chamber. This turbulence is termed Maximum Squish Velocity, MSV is rated in meters per second (m/s).