Hemi wins Engine Master's Challenge

GMachineDartGT said
The new heads are 20CCs smaller than the 08 and prior head, so compression is real high...

thata assuming the used a stock piston. so they could have compensated with the piston choice. the heads are also a closed chamber design, and outflow the older 5.7 heads and almost flow as well as a 6.1 head.