early 273 pistons.

I got that book. I'll check it as I remember it has an extensive spreadsheet of all the LA pistons dims that I'll scan and post. Duh, I forgot I had it (but cant find it!) . But that dimension ensign called out makes sense now, Thanks nm9. The book lists 9:1 for 68 with open chambers and 8.8 with closed chambers with almost the same pin height. Was the closed chamber head just deep?