So I am porting, hogging , portmatching, whatever you want to call it. My 2.5 inch ramshorns to my ported 292 heads. After 2 hours with a couple air grinders, various carbide bits and grinding stones. The results don't have a single straight line or right angle anywhere to be seen. My compressor is making a funny noise, my garage and my clothes are covered with fine iron shavings and grinding stone dust. I am questioning how much money I am really saving by not sending them out and I am stunned that anyone managed to get the ports in my heads so straight and square. Oh yea, and I have only done one of them so far. A tip of the hat to all you head porting fools put there.
greg

And you thought aluminum heads were for weight savings... :D

Yeah I hate doing cast iron.

When I had my stock heads ported, the guy said it'd be about $500 ... just for the bowl work and seat enlargement. I paused, then said, "If you pick the correct springs for my camshaft, then I'll let you do the port work too." He agreed, and I dropped my visa on the table.

I at least got the sticker shock warning from folks here at Team Chevelle.

It's almost as bad as sand blasting without a cabinet.

#1, don't use stones. If you don't have the size/shape carbide cutters, buy the ones you need. You will be miles ahead for the money spent.
#2, I also only use an air die grinder for sanding/finishing most of the time. I have a good electric die grinder with a varistor to control the speed. Much cheaper and more efficient than running your air compressor to death. I do enjoy porting but it does take some money/tools to be able to do it efficiently, which adds to the enjoyment of doing the job yourself. JMHO.