we tried to break a stock LS engine on the dyno and couldn't do it.
junyard 4.8L LS V8
opened top ring gap up to .028 from .015 using the factory rusty rings
reworked stock heads
comp hydraulic roller
60 dyno pulls!
1,203hp at 26psi and it didn't break...
read all about it in the September issue of Hot Rod Mag.