Check out Honda-tech under the forced induction forum. Earl does a write up on how Bensons sleeves blocks and has a picture of the closed deck h-series sleeves. For the record the sleeves are bored out to the cast aluminum section and then the ductile iron sleeve is press fit in.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
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.