At about 37-38 lbs of airflow you are at the end of the compressor map really for even the T34.63

The CR that you have (standard i assume) is going to struggle to allow you to consume that much air at moderate RPM without getting Det or retarding the timing a lot or running very rich (all of which will lose you power)

Standard cams dont like to rev a lot, so consuming the air with less boost by reving harder isnt an easy option, and anyway for that sort of flow on a T34.63 you actually need big boost to stay on (well off but not by much, lol) the compressor map.


So i agree with dingy, its not a walk in the park.

380 is though on a .63, so it depends on what you mean by 400, do you mean specifically 400 to tell your mates in the pub, or just in the region of 400 to make a nice quick cossie