929 pistons/954 head gasket
1) Just out of curiosity, on a stock bore 929, are there higher compression pistons available without changing bore. And if so, what is the prep for the cylinder walls as well as what type of characteristics would come along with this.
2) I understand you can install a 954 head gasket on the 929 and if so, has anyone done this and if so what notice did you see in performance. Also if the calculations were made, what did it bring the compression ratio up to?