how do i port and polish an intake manifold properly withough fuking it up ...?

or isd it better just to have someone else do it?

 

It is very difficult to do properly and even harder to explain in a forum. Basically you have to open up the intake and exhaust runners to the max allowable increasing airflow but all is not well just yet. You can achieve so fabulous flow number and seriously muff a set of heads at the same time. You have to decide if you are street or full race and what RPM you need to run. Because you have to tailor port shape to maintain proper port velocity for proper fuel mixture. So to start you will need all the grinding tools, a flow bench and velocity measurement. Generally you need to maintain a .85 - .9 intake ratio for valve size and to help maintain velocity. But all said and sone, best left to a real expert not your buddy (Unless he happens to be an engineer on a Nascar team) and find a real good shop that has serious clout in the industry for great work.

If you are just going to port match just get a junk head to play with first to make sure you dont puch through anywhere.

 

If you're just going to clean up the casting flash and gasket/port match, you should be fine. But a serious p/p should be done by someone with experience, preferably someone that owns and uses a flow bench.

Best of luck!

 

Here is a how-to if you wanna give it a shot...
http://www.angelfire.com/space/neon/porting.html

 

This is some great info that needs to be resurfaced.

 

i just did my intake mani from that how-to showed above. i didnt actually port the 4 runners but i did remove all the injector dips and the egr hump and the two little mountain looking things in the bottom chamber right under the throttle body inlet. and i smoothed everything. so basically i just polished everything and removed everything that blocked/restricted the flow.