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03-26-2009, 12:34 AM
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#1
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Started Porting the Heads on the Chevelle
I decided I needed to start working on the Chevelle since it's been sitting for such a long time. I pulled one of the heads and started cleaning up the ports and combustion chambers. I started tearing it apart at about 8 tonight and my wife came out and got me a midnight so I only finished a combustion chamber and exhaust port on one cylinder. I need to get more supplies tomorrow so I can work on it again tomorrow night. I'll also take some pictures of and post them up.
Glenn, do you have access to a flow bench? If so, would you be willing to flow my heads for me? I'd like to finish porting one head and then compare it to the other head before I port it.
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03-26-2009, 10:05 AM
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#2
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by 94cobra69ss396
I decided I needed to start working on the Chevelle since it's been sitting for such a long time. I pulled one of the heads and started cleaning up the ports and combustion chambers. I started tearing it apart at about 8 tonight and my wife came out and got me a midnight so I only finished a combustion chamber and exhaust port on one cylinder. I need to get more supplies tomorrow so I can work on it again tomorrow night. I'll also take some pictures of and post them up.
Glenn, do you have access to a flow bench? If so, would you be willing to flow my heads for me? I'd like to finish porting one head and then compare it to the other head before I port it.
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Unfortunately, the Flow bench I had access to is gone.
What I found is: if you use a flow bench, all you will do is drive yourself crazy. You'll be there for days. I once spent 3 days on one port. ![Bang Head](images/smilies/banghead.gif)
__________________
64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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03-26-2009, 10:10 AM
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#3
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Power's off.
Join Date: Dec 2008
Posts: 673
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Port, polish, CC them and call it good. ![Wink](images/smilies/wink.gif)
__________________
Chrome don't get you home.
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03-26-2009, 10:24 AM
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#4
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Quote:
Originally Posted by BRUTAL64
Unfortunately, the Flow bench I had access to is gone.
What I found is: if you use a flow bench, all you will do is drive yourself crazy. You'll be there for days. I once spent 3 days on one port. ![Bang Head](images/smilies/banghead.gif)
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That's okay. The only changes that I'm making are porting them and then installing new valve springs so I guess I'll see if I did any good when I take it back to the track.
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03-26-2009, 10:29 AM
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#5
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by big2bird
Port, polish, CC them and call it good. ![Wink](images/smilies/wink.gif)
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Polish in not really needed. It's a waste of time on a street driven or race engine that is not torn down on a regular basis. A good smoothing of the exhaust ports is all that is really needed. You never want to polish the intake runner of a carb engine. When I do the Port Class for you guys I will explain all that. ![Judge](images/smilies/judge.gif)
__________________
64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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03-26-2009, 11:01 AM
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#6
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Power's off.
Join Date: Dec 2008
Posts: 673
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Quote:
Originally Posted by BRUTAL64
Polish in not really needed. It's a waste of time on a street driven..........
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There ya go, talking about that primer paint job again............. ![Rolling](images/smilies/rolling.gif)
__________________
Chrome don't get you home.
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03-26-2009, 11:15 AM
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#7
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by big2bird
There ya go, talking about that primer paint job again............. ![Rolling](images/smilies/rolling.gif)
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Primer is God's gift to the body challenged. ![Nuts](images/smilies/nuts.gif)
__________________
64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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03-26-2009, 11:25 AM
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#8
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Quote:
Originally Posted by BRUTAL64
Polish in not really needed. It's a waste of time on a street driven or race engine that is not torn down on a regular basis. A good smoothing of the exhaust ports is all that is really needed. You never want to polish the intake runner of a carb engine. When I do the Port Class for you guys I will explain all that. ![Judge](images/smilies/judge.gif)
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I don't polish anything. I do smooth out the combustion chamber though just to get rid of and sharp edges and I unshouding the intake and exhaust valves a little. I'm not doing too much on the intakes because they are already fairly large for this engine. I also know that the rough surface helps keep the fuel atomized and prevents puddling so even if I were to enlarge them I would keep them rough. However, I'm just smoothing the entry on them and blending the short turn radius because they left a little bit of an edge on the intakes. Most of my work is on the exhaust port. I'll take some pictures tonight and post them up.
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03-26-2009, 12:16 PM
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#9
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by 94cobra69ss396
I don't polish anything. I do smooth out the combustion chamber though just to get rid of and sharp edges and I unshouding the intake and exhaust valves a little. I'm not doing too much on the intakes because they are already fairly large for this engine. I also know that the rough surface helps keep the fuel atomized and prevents puddling so even if I were to enlarge them I would keep them rough. However, I'm just smoothing the entry on them and blending the short turn radius because they left a little bit of an edge on the intakes. Most of my work is on the exhaust port. I'll take some pictures tonight and post them up.
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Actually, you are doing it right from what you wrote. Can't wait to see some pictures. ![Big Thumbs Up](images/smilies/biggthumpup.gif) ![Big Thumbs Up](images/smilies/biggthumpup.gif)
__________________
64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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03-26-2009, 11:11 PM
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#10
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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