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THAWA, I suppose the EG33 does lean towards the pent-roof design, but from pictures I've seen, it more strongly resembles a hemispherical design that the EJ22 heads. I thought I read from a legitimate source somewhere that they were considered to be hemispherical, but I may be pulling that recollection out of my arse. The distinction between the two isn't exactly black and white. "Hemis" never are truly hemispherical and pent-roofs sure got a lot of curves these days. Maybe I'm just splitting hairs.
It appears than the data on compression ratio history is simply inconclusive. Since the EJ22 and EJ22T heads are not identical, they may affect compression ratio. Because there was not a simultaneous change in compression ratios throughout the years with both engines, it doesn't appear that you could accurately speculate what the difference is. I guess somebody needs to crack 'em open and pull out the calipers. It would've been so easy the other way. Darn...
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