Re: High Compression Head Replacement
75 would be high for stock compression, people typically report 55-65. Somebody on this board reported 45 a couple days ago, although I'd be a little concerned about a number like that. Similarly 110 is more than I would expect from a 5.5 head. Maybe 100?
The OP is ultimately the one to weigh the tradeoffs. You'd get slightly better performance from a 6:1 head, but is it worth the cost of the part, plus shipping, plus you might need to have it milled flat, plus you gotta paint it, and you're off the road while you're waiting for it, etc., etc.
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