Originally Posted by Billgt63SS
On a High Horsepower 350 pump gas what is better?
Flat top pistons combined w/the chamber volume needed to get your target compression ratio is the best formula in nearly every case.
There may be an argument made for an inverted dome piston combined w/the chamber volume needed for the target CR, but generally speaking a FT w/a smaller chamber will give better flame propagation and a cleaner burn w/better quench/squish
action than an open chamber and a dome.
The shape of the chamber is also an important part of it all. A heart or kidney shaped chamber having a larger area quench pad and a more central spark plug location biased towards the exhaust valve (like on the Fast Burn and Vortec heads seen on the right, below) will give a better quench/squish action and detonation resistance than even the earlier small chamber SBC heads (like the fuelie heads, left below) w/FT pistons.