Most hp with a gs-r

How much of a gain could i get outta a b18c1 with just changing internals and port and polish?

depends on what internals you change.

every single thing.

well it'd depend on how wild the cams were, how high the compression of the pistons were. Also what other parts you have and how well they work (ie; header, exhaust, intake, intake manifold). Then you'd have to get it professionally tuned to get the most potential out of it. I'd recommend searching around and looking at various setups others are using to get an idea. There are just too many variables to be able to answer that question without a lot more information than you've given. And be prepared to spend a lot of $ if you're doing a lot of motor work.

How much money you got?

There are too many variables to give you any kind of hp or price estimate. You need to ask this question again, but this time give us some information.

On a VR6 site I saw a dyno of a N/A GSR high compression I think it was 12.5:1 or 13.5:1 I think it had stage III cams I think they were toda.(not too sure what brand but they were stage III) The car also had bigger T/B I,H,E adjustable cam gears and a port n polished head. I saw the dyno read 270whp(no NOS either). I odn't know if that was the highest whp'd GSR but it had a nice power curve.

15 Hp

15 Hp

Wow we have an extremely talented young man here. :rolleyes: