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Like Hondahaulasslic said, you do not want to hog out too much meat on the intake side. You open that puppy up you slow the air down. That is the last thing you want. But you do want a slightly larger exhaust so to help the faster moving air out even quicker. Do too much and the overlap fresh fuel leaves with the hot air you flowed it too good! That hog on the exhaust is the same increase the header pipe is so that hot air keeps moving.

Then on the exhaust side (still), you want something I forget what they call it, but think of a river bed and water moving over an down a rock? That speed down the rock from the upper part of the flow is that speed demon you do not want to hog out that step or "D" whatever port design that the engineers dream up, you want smooth straight flow in and out. Like one straight line. But you as a porter need to have a port bench. And if that person does not have a port bench... He's as good as you guessing at too so start using your fingers and some 400 grit and go after it.

You have a finger and you blend every bump or ridge with any transition. You smooth and tit or bump that my slow a more smoother down the port all the way is that baby smooth no act knee face divots you fucked it up! It's a black art and head is the heart of HP. Only way you watch the HP increase year after year is a different port design of a new engine-redesign.

dqoc,

I boxed in these three just listen to that HP gain without any port work. Not only do you need a valve job, the guides in that old head are way out of spec is my guess. Try and find a good valve installer slash seat cutter slash a kiss on that worn seat is do you replace the seat is now weak you removed porting material. You probably will not weaken the seat insert, but money spent on HP is better spent on a newer slash new bike.

You pour $$ in an old bike, blow it up spinning up the (old parts is a) 'fuse' is that something is going to blow somewhere is all about compression, not porting. You want to port a head with 70Pee Yes Eye said it is low on compression and you are ports of call is I lasso dee rode dee oh the 3 Amigos up ^^^ dare to tell you it is your bike, your head, your money spent the way you want to. Not my business or dare business telling you about valve jobs give good (head) HP.

Port jobs alone blow year wad for knot thing is day fook is disshit! Suck is him into a port job and you HP my change mid-sentence. I need two watch you tree ye me goes is around ear. I think they meant I am getting too out of the loop is think where do you start if you are looking for HP? It sure is not the port flow yet. You can leave the head alone and blend the spigots call it a day. You want so bad that new valve guide pull and the seat cut fresh is to find a head fresh in a box with new valves. There is your HP change you have that cylinder found in a box with a bore job slash all the top end parts fresh will beat any port job you pick any bike here.... Sans a fresh top end that can pump some leak-down to 1%.

You give 10 guys a 200HP bike and now everyone go take a lap. If you come back and say it was the bike after you were forced to witness 10 bikes to prove it was not the HP. You missed the compression slash dampen near perfect the settings are the same spec as the 200HP... No, you ride the spec bike.

Now that you have all that HP under you, there are 9 others with the same HP.... YOU GOT BEAT! Did that port job (help) that is not now that important if you were handed all that HP and you got whooped is you could not handle way too much hp if you got whooped. Guy on the bike that won whooped the 200HP... Someone Port his head!

Porting is a Catch22 is how I see porting.