hey CRASH7772 is with me and he has a dyno sheet to prove it. i guess he just drew that all out huh? 225 is the rwhp number. theres a dyno sheet on mm&ff website. stock 5.0 with 147k miles dynoed at 222rwhp. they dynoed it before adding nos then it spit out 303rwhp i believe.
The Y heads flow about the same as the Gt40P heads. With a KB on that engine in good shape, seems like he should be at 270-300RWHP to me. Look what my first untuned dyno was without the KB.