This is on a built motor. Standard pistons dont like 26psi. Motor is rb25 with rb26 crank, forged rods, forged 20thou over pistons, jun 272 cams, ported head, cam gears, 8.3:1 comp. Had a few PM's about response etc, people need to remember its hard to trade off massive power with standard like response in fact its impossible, this is a big single it wont be like 2530's and it doesnt pretend to be. That being siad with GCG's mods it makes the 19psi it is on now at around 5200rpm which is pretty good, i cant remember when it was running higher.
Cheers