I've been scouring my books to make sure I didn't put my foot in it, as I was sure there was something astray here!
Here's an official HRC note, back from the olden days when everyone wore grey and walked around very quickly!
As Steve says, you ideally want an H (High compression) barrel and L (Low volume) head combination.
It's very important to measure the barrels though, as not all barrels are created equal! The manufacturing variances and plating companies that machine a little off them all conspire to push the tolerances over the top! I wouldn't (and don't) personally run anything less than 97/98 Super UL for anything other than emergencies with the preferred setup, as it will be right on the boundry!
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Andy.
NSR-WORLD.COM
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