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Unread 07-13-2019, 08:32 AM   #1
Getting Wild
 
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Default Head porting tools for GX390/Predator420

I know there are a lot of tools to port heads, but is there an inexpensive starter kit that could be used to improve flow? I already have die grinders and some small bits just have never ported a head before.

Thanks in advance for your help


This is similar to what I have but mine are from Blue Point (Snap-on) that I bought from many, many years ago...

https://www.mscdirect.com/product/details/00478503
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Unread 07-13-2019, 11:05 AM   #2
Crazy Ole Man
 
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Default Re: Head porting tools for GX390/Predator420

I would suggest a Dremel and and flexible drive cable so you don't have to deal with the tool weight and air hose. The tool is more controllable. Watch some Youtube and learn how its done.
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Unread 07-13-2019, 08:27 PM   #3
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Default Re: Head porting tools for GX390/Predator420

I wouldn't use anything that aggressive. I liked my Dremel with abrasives. Those heads are aluminum so you have to keep the speed down or the metal will melt into the abrasive. You can use a wire brush to clean out the sandpaper material. Go slow, take your time, take a little off at a time. You can always take off more, but you can't put it back.
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Unread 07-14-2019, 03:44 PM   #4
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Default Re: Head porting tools for GX390/Predator420

Quote:
Originally Posted by chrisr32 View Post
I know there are a lot of tools to port heads, but is there an inexpensive starter kit that could be used to improve flow? I already have die grinders and some small bits just have never ported a head before.

Thanks in advance for your help


This is similar to what I have but mine are from Blue Point (Snap-on) that I bought from many, many years ago...

https://www.mscdirect.com/product/details/00478503
When I did my 2 heads used carbide cutters such as you have. There is a LOT of material to remove in the valve pockets and valve shrouding.I used old valves to protect the valve seats when doing the !/8" right off the seat.There is also a LOT of material on the pyramid around the valve guide. There a long shanked cutter with the seats taped up worked best.Once the big amounts are removed you can use the fine abrasives to clean up the cutter marks.
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Unread 07-15-2019, 09:49 AM   #5
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Default Re: Head porting tools for GX390/Predator420

Pics of my 5 carbide cutters plus the 2 tool steel units I use for head porting.I lag bolt the head to a block of wood that is clamped to a table for the heavy material removal such as the valve pockets.It is also mounted this way when I use the tool steel rotary file for the valve unshrouding.
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Unread 07-20-2019, 08:21 AM   #6
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Default Re: Head porting tools for GX390/Predator420

I did a quite a bit of chainsaw porting a couple years ago. The Dremel and flex shaft really was the way to go. Take your time, you can take too much off in a hurry. I would also recommend a file card... the carbide tends to load up. The file card will clean out the bit.
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Unread 07-20-2019, 09:46 PM   #7
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Default Re: Head porting tools for GX390/Predator420

I do not have any long burs so I will probably get at least one to reach the hard to hit areas and a long roll sander to take out some of the machining marks from the burs. I do also have a Dremel and will probably try porting a Predator 420 head this winter.

Thanks again for your feedback.
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