Actually, the AFR 165's are only available in a 60cc combustion chamber now. They recently ceased production of both a 58 and 65cc head. I got mine through JD's performance as part of the group purchase. I was the lat one on the list, and it took a LONG time to get them. I ordered them at the end of January and I just got them last week! It wasn't Dave's fault, he was actuall really nice about it, but AFR can only produce so many units a day as they can not speed up their CNC machines. When I spoke with them they were running round the clock shifts 6 days a week just to get caught up, and they just purchased a few more CNC machines to also help out. You can call Dave, but he told me that he doesn't really like selling them anymore due to the long wait most of us that ordered them experienced, but please call him anyway, he's really nice and will help you out and steer you to someone that can help you. The only way I know to get them quicker is to get them from Ed Curtis, as last time I spoke with him he had a few sets on hand.
The factory E7TE's combustion chamber varied from ~63cc to 65cc, the variance was due to variables in the manufacturing process, not by different years or anything. With a 55cc head on a stock bottom end you'll be around 10.1:1 with a regular thickness head gasket. I'm actually getting a gasket from Ed Curtis that will in itself bump compression by .1. Hope this helps.
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