Any one have the correct answer for this cause I have 781 head as well to mate to the TRW L2349F pistons I bought. I bought these haveing been told by the TRW tech rep that the 781 heads are 118CC which gets me between 9 and 10:1. If they are 113cc Im gonna have to find other heads. So anyone with facts and can give the correct answer for me and the guy who originally posted this I would appretiate it. I may buy after market heads regardless but would like to know for reference regardless.