Stock H22 record is in the 420-ish whp range.

Broken ring lands is a result of poor tuning.

 

You know i am not saying it's impossible though.
Using that same forumale, assuming the BSFC of a tubo h22 is 60%, some 450 ccm injectors, if you boost the fuel pressure to 80 psi and the dutycycle to 90% it makes 350HP.
When i say I max out the 550 ccm, it's on stock fuel pressure and 80%.

 

The much-bukkake'd Full-Rice kitted B-series with boost turned up to their sweet spot are capable of .38-.42 BSFC.

 

well thanks, it lightens up a lot of thing for me !!

In that case, if a H22 with a good turbo setup is really around 0.40 BFSC and you stay within 80% duty cycle, the DSM 450 ccm injectors at 50 psi of fuel pressure are good for 370 HP !!!
Yes, that's 300 WHP easily!!

Then no wonders why my maxed out 550 ccm h22 setups pulled like crazy....