Originally Posted by cams 98 silverado

Theres an article on Truckin where they took a 150k mile 5.3, stock bottom end, cleaned the rings, gapped them a lot and put in a turbo friendly cam, some decent heads and 70 pulls at the max 23.9 pounds of boost. made 1300hp. they wanted to find the limit to boost, and they stopped because there was zero compression on the back cylinder. popped a valve cover off and a rocker just fell off the valve, like twisted, so they took the charge pipe off and the engine still ran with the broken rocker. over 70 pulls and they stopped at 23 pounds and it still ran. IIRC they used an air to water intercooler but im not sure they used meth. still trying to figure out why they obtained 500hp N.A with a cam, heads and LSXRT intake... but anyhoo max boost around 23 pounds got the 03 LM7 block 1300hp and 1100tq. read it yesterday. it made me wanna buy things.