ported heads, cam, DOD delete, ported intake, ported throttle body, headers, full exhaust, underdrive pulley, injectors, etc. But yes, all motor. stock bottom end.
Going to hit the track in a couple weeks to see what the G8 will do. Are there any tracks preferred over others for friday test and tune? Will be on street tires.
Hot rod made 451 on a 4.8 before going to turbos. Note the arcticle says 5.3 but they later find out at the end it was a 4.8
http://www.hotrod.com/how-to/engine/hrdp-1109-stock-gm-ls-engine-big-bang-theory/
4.8 as in LS based truck motor? There are plenty of Heads/cam/intake making over 400. You will need to spin higher RPM to get the most out of it.
My 6.0 will be making 540-550 crank HP in a month or so on Heads/cam/intake/bolt ons and they only came with 360
So they want street racers to take it to the track to stay "safe". But if you race on the "street" on a show, you are banned from the track. Makes sense.