I know the pistons & rods are weak as everyone has been saying. The stock crank and block are strong as hell and have seen 850+whp on alot of cars with them. But what about the stock sleeves and main caps. Heard they're not to great but not the weakest points. Especially if you have a good amount of miles on the car. Any who, 8psi is my vote for a safe amount of boost on a stock LS1. 500 to the wheel is alot of god-damn power.