I see the point as to the compression and heat. I'm not sure what I was thinking. I guess that I was trying to equate heat and stress. I've noticed that the NA and SRT seem to use the same head gasket. I haven't been able to find out about the head bolts. It appears that there are four bolts per cylinder. Piston rings are also different.


In the catalogs the crank differences are listed as supercharged (SC) or NA. I'm not seeing a difference for manual / auto. The bearings seem to be the same including the thrust. The crank gear appears the same. The vibration dampner is listed as SC or NA. I'm sourcing a couple online catalogs so they might not be exactly accurate.


I wonder how high the boost goes on the SRT. I'm thinking that the SRT has a 9:1 compression ratio, is that correct? The turbo could be limited for the NA with the waste gate.