hey everyone im looking into polishing and porting my heads on my 5mge price isnt a issue i have the machine at my house to do it lol
I just wanted to no if anyone has done like this and how much do you guys take off
I did it with just a air grinder and attachements. I took off all ridges and just made them nice and smooth. then went back for a nice super shiney almost mirror finish.
dont know how much of a difference it made, but I know there arent really any surfaces for carbon of gunk to cling to so it should stay clean for a while.
Im doing it...well starting tomorrow. Don't take off too much, you have to be careful, look where the valve stem slides in, for the intake side so obviously don't hit that... and as 84 p-type said...just take off the ridges, its more polish than port, you are getting rid of the "casting turds" then polishing it, I find if you run your finger along a intake port, then do some "grinding" or get rid of the casting ridges or turds then polish it obviously, then feel it again....smoother the better air flows better when the passage is smooth, so stay on the safe side, just get rid of the ridges, then polish get all the 20+ year old grime outta there.
Line up the gaskets and port-match everything as well. That keeps the air flowing smoother from intake plenum, to runner/manifold, to head. Making the ports bigger will slow the air's velocity, so not good. Have fun, good luck, and wear safety glasses!
^^ Woops, forgot about that, Thats where you get your "port" outline from, keep the old gasket intact if possible on the actuall manifolds. Then grind up to them, then polish. NO FURTHER than the outside diameter of the "hole" in the gasket.
Bumping an old thread (hey at least I used the search button).
I noticed that the port openings on both the intake manifold and the head are pretty close to being matched to the gasket already from the factory. The port entry on the head itself is machined at an angle going into the head. Does anybody actually blend the angle into the port smoothly or just polish it as is?