Couple weeks ago I decided I wanted to do this after cleaning my intake manifold, and taking a look at the runners.
Just before they meet the gasket there are 2 steps that no doubt reduce air flow. Of more concern however, is how small the runners themselfs are. They are significantly smaller then the intake gasket!
Since my head was ported, and the port is the same size as the gasket, I see no reason why the intake manifold should be so small on the other side!
I used a OEM gasket to mark all the mating surfaces, so I knew how much material I had to remove. From there I used a rotory rasp on my dremel to smooth the casting texture, and to remove the stepping. After that I used the same tool to flair the edges out. Once everything was fairly flat I used cartrige sanding rolls to gain a flat smooth surface. Then I used my finger and rolled up 150grit paper to futher smooth. Once I had it as smooth as I could get it I switched a abrasive buff onto the dremel and buffed the runner with the aid of WD-40. Again I switched out the bit, to a polishing head, and gave it a final biff/polish. End result is a stepless, clean, smooth, polsihed surface that flairs into the gasket to meet the head.
I have 4 of the 6 runners done, and I plan to finish it up tomorrow.
pics:



Just before they meet the gasket there are 2 steps that no doubt reduce air flow. Of more concern however, is how small the runners themselfs are. They are significantly smaller then the intake gasket!
Since my head was ported, and the port is the same size as the gasket, I see no reason why the intake manifold should be so small on the other side!
I used a OEM gasket to mark all the mating surfaces, so I knew how much material I had to remove. From there I used a rotory rasp on my dremel to smooth the casting texture, and to remove the stepping. After that I used the same tool to flair the edges out. Once everything was fairly flat I used cartrige sanding rolls to gain a flat smooth surface. Then I used my finger and rolled up 150grit paper to futher smooth. Once I had it as smooth as I could get it I switched a abrasive buff onto the dremel and buffed the runner with the aid of WD-40. Again I switched out the bit, to a polishing head, and gave it a final biff/polish. End result is a stepless, clean, smooth, polsihed surface that flairs into the gasket to meet the head.
I have 4 of the 6 runners done, and I plan to finish it up tomorrow.
pics:
Comment