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I did porting and chamber modifications on a few of these since Last year and stock combustion chambers all mesured ( untouched with stock valves ) around 39.6 to 40.1cc. The supertech valve springs for the sr20ve as said are the same part number as honda h22 springs. Guys who choose to go the p12 head route should altogether just ditch the 5.5 mm intake valves for the 6mm ones, oversize and bronze sleeve the guides or replace them for 6mm id supertech guides. That gives options for spring/retainer combos and gives the valve stems a bit more needed strenght
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