This is regarding a b18a head

I am trying to find out how much lift the JG Single Competition Valve Springs will withstand. . . all it says on their site is they go to 9,000 - a lot of help that does, with what cams?

They have the max lift for their dual valve springs (13.5 mm) but not for their single competition valve springs - The website they have is junk

I really don't want to buy a whole new valve train if these springs are capable of supporting a higher lift cam than stock. . . anyone who may have this info please post it up as it could potentially save me some $$$. I only want to make power to 7,500 so I don't need a very aggressive cam - I just don't want to take any chances.

They feel a LOT stiffer than the stock springs - I have 2 heads side by side right now : one is from a 2000 integra (b18b) and the other is a JG Pro Series (b18a)

I can slightly compress the springs in the stock head using both thumbs, but can't even budge the ones in the jg head. . . I wish their site had specs for their products.