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Old 12-07-2016, 06:10 PM   #6
E30 Addict
Join Date: Apr 2015
Location: Charlotte, NC
Posts: 434
U may gain a touch of compression with the 7mm head. BMW never changed the advertised compression ratio of 10:1 but did take some dish out of the 93 up (6mm stem head) piston according to the Mahle site. To get back to 10:1, the head chamber would need to be bigger.
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