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Posted by Chris Case [75.36.33.137] on Saturday, December 01, 2012 at 15:03:12 :
In Reply to: Re: "M37 High-Compression Head"? posted by Kaegi [24.16.253.154] on Saturday, December 01, 2012 at 13:40:43 :
Latest head had smaller valve areas cast in, and flowed better for it.
The higher the number, the later design. Though I think the biggest factor in compression is milling.