Stepside, the 781's are 118 cc as cast...that may vary by a couple cc's, so you should still check, but it's definitely not 113 unless they've been milled. I just checked my 781's this very afternoon, I did every other chamber on each head, 3 were 118 cc, one was 117cc...and that could be due to mis-measuring a bit. And forget the burette...for occasional cc'ing, just buy a big plastic syringe, a tach shop or supply store for horses or cattle should have one...30 or 40 cc's is good, 60 would be better. Just fill it with a water/rubbing alcohol mix (flows better) and I put a few drops of food coloring it it, makes it easier to see. The syringe is accurate if filled correctly. Suck the water up into it just past the mark that you want, then tap the air bubbles out and bring the water to an even amount. (50cc, 30cc, whatever size it is) Do the plexiglass thing as mentioned above, and shoot the water into the chamber till it's up to the hole. (dont forget a spark plug in the hole) Keep track of how much you put in, and you''re done.....check a few to be sure.