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Old 11-03-2007, 06:55 PM   #1 (permalink)
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Default Head Porting

As is was bright and sunny today I decided to leave my seat re-trimming for the moment and go out side to play with some dirty bits ( no not rude things). I bought some carbide burrs (like forary files) in the week to do my head porting and had a scrap head lying around so I thought I'd give it a go. How hard can it be? I set myself up a makeshift workbench in the sun, got all my tools out along with the spare cylinderheads for the "Lee". At this point I thought "Sod it, I won't bother practising I will go straight to work on the V8 heads."

Here's how they were before



I stole a bottle of nail polish from Jo and painted the area arund each port. Then I bolted an intake gasket to head and used that as a template and scribed the nail polish so I know how far to open the ports.




Lovley colour, don't you think.

Then I used the burrs to open up the port openings to match the gasket, tapering in to meet the port's original size about 1 - 1.5 inches into the port. Any lumps or imperfections were smoothed down and any square angles in the casting within the port was rounded off. Now I need to polish the ports as the burr leave a harsh surface that will attract a carbon buildup like the Bechams attract the papperazzi.

I couldn't get a good picture of the valve bowls and guids but here are a few of opened ports.





Will update as progress occurs.
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Old 11-03-2007, 08:24 PM   #2 (permalink)
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You're a brave man! Looks good though. I'm always amazed at how rough the ports are when they leave the factory. Are you polishing and smoothing the exhaust manifold (header) as well?
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Old 11-03-2007, 08:50 PM   #3 (permalink)
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wow
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Old 11-03-2007, 09:05 PM   #4 (permalink)
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Thankyou. Yep, I will be douing the headers and intake manifold too. It's not actually as hard as I thought it would be, you just have to take it slowly and gently, and always using a sweeping motion. I will try and get some good photo's of the valve bowls tomorrow, I need to borrow a better camera first. Mine doesn't like closeups.
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Old 11-03-2007, 09:07 PM   #5 (permalink)
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Be careful with the intake manifold - the rough surface aids fuel evaporation giving more power and a cleaner burn.have you read this:-

http://www.torquecars.com/tuning/Porting-polishing.php
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Old 12-03-2007, 06:45 AM   #6 (permalink)
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Already read that, along with pages and pages of other stuff about porting. You shouldn't actuall poish any of the intake side, only the exhaust.
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