Pre2k and Post 2k valves are the same physical diameter, the main difference is that the newer valves have a higher flow rate.
The 97 uses Sheridan springs, unless it's been converted. The LP valves, in a 97 body, need an LP chamber to get enough air, since the early valve chambers are much smaller.
Ideally, for a 97 Sniper, a stock valve would be best. If you want, I have a stock post 99 valve I can send your way. If it works, pay me something for it (or swap me the LP valve). If not, send it back...
Spring balance isn't as important when running constant air. Either way, start with a yellow valve spring and a blue hammer spring.
Let me know.......
Last edited by Walker; 10-20-2006 at 07:18 PM.