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| Port, Polish, and Bowls / Van Engine/ Advise? https://slantsix.org/forum/viewtopic.php?t=34261 |
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| Author: | Rug_Trucker [ Thu Mar 12, 2009 6:58 pm ] |
| Post subject: | Port, Polish, and Bowls / Van Engine/ Advise? |
This is a 78 "peanut" head The exhaust ports? I smoothed and didn't gasket match. I didn't remove a lot of material. Intake and exhaust bowls are smoothed and the rough edges were ground off. The exhaust bowls have a hole for the air injection. (it is a 78 California head with a factory block off plate.) The intake port? So far I have it gasket matched. All smoothed. I didn't take out a bunch of material. I am thinking I can open up the intakes more than the gaskets. I was going to smooth the intake and not gasket match the manifold on the intake side. I am thinking this will create an anti-reversion effect. I called to find out if the '80 has an air pump. I was thinking that the exhaust manifold needs to me bigger than the gaskets. Once again to create an anti-revesion effect. Going to run the stock 1980 solid truck cam, super6 intake, 833OD in a B100 van. Will be using a cat. It is a work truck, I have no idea what he is running for gears. We are going to mill the head, no idea how much. The chambers? Polished, I grooved them a little for the flame travel from the plug hole towards the exhaust valve. The valves were unschrouded by radiusing them. Questions? Comments? Criticisms? I am compiling some pics. |
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| Author: | Dart270 [ Fri Mar 13, 2009 7:30 am ] |
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Do not spend a ton of effort on the ports, more on the bowls and blending into the valve seat. You want exh port to be a bit smaller than the header pipe, from what I know, so don't go much beyond the gasket if at all. Forget about polishing. It will likely all be covered with carbon and residue after a short time anyway. If this is a work truck, then maybe mill 0.060" to bump comp a little, but not too much. Lou |
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| Author: | runvs_826 [ Fri Mar 13, 2009 10:54 am ] |
| Post subject: | |
Polishing it over-rated for at home porting. Make it look nice so there is less for the carbon to stick to. Use a gasket as a template, and don't bell shape to it. |
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| Author: | Rug_Trucker [ Fri Mar 13, 2009 3:24 pm ] |
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Quote: Do not spend a ton of effort on the ports, more on the bowls and blending into the valve seat. You want exh port to be a bit smaller than the header pipe, from what I know, so don't go much beyond the gasket if at all.
Lou Yep to the above. Exhaust is still small. What I don't like is the air injection holes in the exhaust bowl I think he has an air pump. Gotta pass emissions in Nashville. |
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| Author: | Rug_Trucker [ Tue Mar 17, 2009 6:52 am ] |
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Quote: Polishing it over-rated for at home porting. Make it look nice so there is less for the carbon to stick to. Use a gasket as a template, and don't bell shape to it.
Yep, not going for mirror finish. .060 off the head is figuring I am using a Permatorque Blue head gasket? I wonder about just reusing the factroy steel gasket. 
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