[Christ]

As far as I can tell after hours and hours of reading, the basic idea behind the Singh Groove "technology" (if you will... I won't.) is creating a "gust" situation to aid turbulence in the combustion chamber.

Optimal configuration would direct that gust force in the same direction as any swirl or turbulence which already occurs, something that is difficult to discern without being a trained engineer in such arts.

Cutting grooves in the head will lower your compression slightly. If you choose to do so, you can make up for it by milling the head, block deck, or using a thinner head gasket.

I can see a better effect occurring in higher compression builds, or HO builds which ingest larger percentages of air faster, such as turbo/supercharging.

The added effect is a more even pressure on the piston face as the burn event occurs, which, in theory, keeps the skirts from scraping the cylinder walls with as much force. You could, I suppose, create "optimized" Singh Grooves to lessen the frictional losses in the engine from skirt sliding.