on a stock motor, a properly tuned 14 psi turbo or 11 psi blower will be fine, for nitrous im not really sure, a 75 shot is no problem, im sure people have ran more, justin at vmptuning.com is running 17 psi through a 100% stock motor, it is his dd even though boost is turned down to 14 for the DD

no one has busted a block or crank cause the 3.8 is an underdog for fords "muscle car V-8" so no one reallly builds them, it is believed they are capable of the majical 1000 mark however

 

wouldnt the internals have to be beefed up to run those numbers? I thought they fail at like around 300-350 rwhp. The block itself is close to indestructable.

 

no the power has nothing to do with it compared to an improper tune. you can make 320rwhp with a procharger on a stock engine if you run it real lean but boom. 290rwhp with a conservative tune and it will last as long as a factory NA setup