Right, discussion time, well i hope so and not a one answer closed subject.

Example.

Standard head, the known norm is that there only good for 400bhp, but what about torque? i.e can you chuck more boost at it to create a much larger punch\torque lower down, i.e like a resistor on a turbo, and then bleed the boost off at high RPM. Or will this cause serious surge issues.

I.e T4 on a standard head, or a GT30 on a standard head.

I know one of Karls fav conversion is the t4 standard comp setup (i think)

so how far can the envelope be pushed? I guess what im getting at is the thing karl\stu\mike was discussing about pushing a standard engine