[QUOTE=techinspector1]Thanks Pat. The only problem is that he's dialed in on that one particular cam and to use it properly, he needs the static compression ratio and to get there, he needs the overbore. I'm sure you are absolutely right on the thin walls and he just may have to settle for a little bit of a mis-match at 0.030" over and a little less c.r. Thanks again for your input. I value your knowledge.[/QUOTE ok i did not run the number on them he would have to cut the heads .that can open a new can of worms. but spr makes the piston for the edy heads never look in to it and can not tell you what the cr of them is he may want to look in to it ar JE piston web