Originally Posted By Cab_Burge
What does "soften the chambers mean"?


It's a very shallow, slightly angled concave cut on the quench pad area of the chamber. It makes the engine less timing sensitive and opens up the tuning window on heavy nitrous or boosted applications.

Cruiser: 66 Dodge Coronet 500, Indy SR 440, Gen 7 Accel EFI = 11.38 @ 116.
Racing: Brand X, X275 Procharged Smallblock on M1, Leafsprings, Holley EFI = 4.30 @ 168