I note that the grooves cut by Mr. Singh are 'aimed' at the spark plug - looks like as the piston moves over TDC the groove directs the mixture out of the quench area directly towards the spark plug as a high-speed jet.
There is certainly some good sense in the Summit Racing engine building article too. I am sold on Keith Black/Silvolite hyper-eutectic pistons but the crown polishing and possible ceramic coating raise this area to a new level.
In the early days I tried 'ceramic coating' by spraying the heads of pistons with VHT Header Paint. Worked well - except the damned stuff flaked off after a while and the tiny flakes got pounded into the valve seats! The white stuff worked best and the pistons had to be 'cooked' on a domestic oven at around 300 degrees F to pre-cure the paint.
BTW: Don't get caught 'cooking' pistons or exhaust manifolds in a domestic oven - it will cost you a brand new Thermo-wave oven!!! Which is even BETTER to bake manifolds and pistons in ...........
