check this out
http://www.alaniztechnologies.com/b16vsgsrflowtest.html
Just like I said before they flow about the same, get whatever head you can find at the best value. Dynamically it seems from my experiences and from a few others I've talked to who also have experience, the gsr head works a bit better on lsvtecs than a b16a head.
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Gracie Barra Clearwater

Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.