Originally Posted by Roelof

Maybe for the top 30 world class racers as with electrics those guys can notice a difference if the electric motor is placed a few mm forward. The avarage racer will not notice a thing.....

The few holes Novarossi is drilling in their previous heads are just a few gram. I have drilled 16 holes of 4mm into a head and it did save just 5 gram.

Originally Posted by wingracer

In 1/12th I can feel the difference in just a 6 tooth difference in spur, and subsequent pinion change, which moves the motor forward maybe 2 or 3mm.

As for a lower head, I doubt you would feel the difference but it may make a very small difference on the watch. Of course most drivers are not consistent enough to be able to find that slight difference in times in all the background noise of poor driving