the first, second and third harmonics they call snap crackle and pop (i'm serious).
if you open a spring at a constant rate it can create these harmonics so they modify the parabola so the curve is not a pure parabola.
this helps to control the valvetrain.
cams grinds are really hi tech these days and you need to be a mathematician to understand them.
unless your trying to get that last couple of percent you only need off the shelf stuff.

so in terms of performance, how well does the standard camshaft cope with supercharging? is it a lot less than ideal or will the difference not be massive? the car wont be raced or anything like that remember

I've heard several people say that the 1970-design GX camshaft profile is every bit as good as any modern non-roller cam profile. It seems hard to believe cam grinders haven't learned anything in the past 35+ years.

i pulled down the a15 today, cylinders in really good condition, its got no wear there. i havnt got as far as taking the crank and pistons out so i dont know what the journals are like.

The curve is not a symetrical one, but it will always be bell shaped more or less. I learned at school that a curve was parabolic if it did not intersect the the Xaxis in more than one place. IE, there is no point on the graph where a vertical line can intersect the curve in more than one place. SO unless the camshaft rotates backwards at some point this will never happen. You'll always get continous bell curves. Although there will often not be symetry between the opening and closing ramps. Alhtough my brother tells me(just now) that I'm full of sh!t. And a bell curve isn't automatically a parabolic curve. I guess I wasn't paying attention at school. (Well thats no secret) I'll stop using big words I don't know the meaning of.

Back on topic, A stock cam will work with a blower, but why not go for a big one? the boost willl be higher with a stock cam that will make more heat and less power.

more to it than that
i suspect a bell would be a logarithmic curve.
a parabola by definition is symmetrical.
so thats assymetrical cams out (as a whole)
inverted flank roller cams couldnt be parabolic
but parts of the curves probably are

yes back on topic
anything you do to the blower (discounting heat etc..) that makes more boost will make more power.
anything you do to the engine that makes less boost (ie: swallows it better) will make more power
most cam catalogs will have turbo or blower cams marked as such
turbos are a little different though because they rely on the pulse from the exhaust to drive the turbine

heres a picture of the bore, do you reckon its recently been worked on?




the rings dont appear to be worn. the bearings are all STD. ill get it all measured up tomorrow

1. Looks scratched - up and down scratches

2. Honing is supppose to be slightly diagonal, these are straight 'round

That looks like it has been honed by a cretin with a bit of 40 grit wrapped around an old bleach bottle. I would NOT use that block without having an engine reconditioner hone the bores for you. You can do it yourself, but you really need to use an air drill so you can get it going slow enough to get the 60' pattern.
I wouldn't (And dont) bother. I know a bloke who does a hone and a block wash for $80. Used to be $50, but I guess thats inflation.

It may even need to be rebored depending on how deep those scratches are.

holy freakin christ
whoever did that wants f#cking
i could do better with a brick by hand
find a machine shop with a sunnen hone
dazza
brown water jackets indicates air in cooling system




this is more like it
note cross hatch pattern(of which your pic has none)