Hey um..
i just got the a15 head ported and the bloke says that it's like flowing 130 on the bench.... i dont understand can someone explain for me pleas in not as head saavy as i may seem.. is 130 good oraverage or what..

It depends on which mm or inches he is measuring, for example:

130cfm @ 32 inches of water

Is a medium port job, good for a hot street A14 or A15 engine.
But if it is

130cfm @10 inches of water

That is different. See head porting

he _might_ be referring to bhp. It's not often used by porters any more, but you can do a bit of math (and take into account the engine in question and it's idiosynchrasies) and have a good stab at the potential hp an engine could make with the head in its current ported condition.

Generally speaking, most porters, if they are talking about flow itself, use 25 or 28 inches of water as the pressure drop (vacuum) level to test the flow at. It's important, because even with the same head, the higher the pressure drop, the higher it will test out to, so you need both.

To take it further still, you'd want to look at not only the peak flow at high valve lift, but what it flows at roughly every 0.050" valve lift increments. The valve spends only a split second at peak lift, but much more time in the midrange lift area (naturally enough) so often that is the more representative data to take into account

If it is 130bhp potential, that's pretty darn good (let's face it, you are approaching double factory output), of course you'd need decent exhaust, intake, carburettion and cam profile to actually achieve that hypothetical potential..