On the product info/dyno they have 5 and 10 psi. 
PSI on motor
How is it stronger???? iron block vs. alum. block.......5 bolts per head vs. 4 on the Ls1.......the ls1's heads flow better but enlighten me on how you think it's stronger....
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Yes it is, but if you happen to get one tank of slightly watered down gas things can go boom. Back in high school I had a buddy who worked at a gas station who was directed by the owner to stick the water hose in the tanks to water the gas down so he could make more profit. Bob
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Verdad Gallardo oh yeah..my mistake..forgot about the aluminum blocks...i was thinking of the vortec motors with the iron blocks...i do know they are much stronger than the lt1's old school style bottom end