These are not finished yet, we had to get a longer bit!! These are LS6 243's milled .010! Let me know what you think of them so far. and what else we can do or how much more we can go with them

 

Not even close to being enough material removed to make a difference.

 

theres more taken out than you think!! but like i said there not done yet!!!! i would like someone to give me some measurements to check in some areas

 

That looks pretty rough. I'd start off with some sanding cartidges and get a hand with how those remove material. Then move onto the carbide cutters. That'll help you with the chatter marks you're seeing.

 

i would stick to just blending in the bowl, the area under the valve and valve job and back cut on the valve. dont go nuts cutting too much material around the guides

 

Hard to tell from pics. Put a better "tear drop" on the valve guides. I see lots of sharp edges in there. Hogging the runner out isn't going to help as much as you think. It's not as much about removing material as it is helping air get through the head. Try to keep a consistant CSA. Here's a "get started" article you may want to read.

http://www.popularhotrodding.com/eng...ing/index.html

 

Leave the porting to the pro's

 

yea ill be blending the bowl area some more and working on the sharp edges when i get the longer bit all i had was a 2" bit and we ordered a 6" to reach better

 

anymore info for me guys!!! all is greatly appreciated

 

I would say profile the exhaust side guide some more. That is one of the biggest restrictions on the exhaust side. Think about the velocity of the gases hitting that nice flat surface. def slows things down a bit. Just don't take material off the top of it or you will ruin the contour you want.
Like KMS said hogging out the runner doesn't help much just smooth them out and that will be enough. Also even though some may argue I believe a nice smooth finish on the exhaust side helps it "shed" carbon deposits better than a rougher finish. You don't need or want as smooth of a finish on the intake side as a rough finish (40-60 grit) aids in creating a boundry layer to help keep the fuel in suspension. (more important with a carb) Take your time and make sure the ports are as even as possible. Also if you haven't already find some pictures of some heads that have been sliced at the ports so you know how much material you are dealing with in all the areas that you are working. You definatly don't want thin spots on the exhaust side. Also careful on the intake side openings don't open them up much, or you could inadvertently compromise the intake sealing surface of the head.
So far good effort just take your time and you may be pleasantly suprised with the results. Even Pro's started somewhere LOL.

 

Thats a start. Like said you need to remove more, tear shape it and then blend it all in. Here is a pic of my "home ported" exhaust port. This still needed a little finishing work to it but you get the idea. It is hard to get pics of the ports with my crappy camera. It is smoothed all the way to the guide. I was also using a 6" carbide cutter on my air die grinder, cuts it like butter!

 

thanks man! all im really going to do on the intake side is remove the rocker boss and blend the bowl, i dont know enough yet to tackle the runners so i just kinda smoothed them up. the exhaust side i opened the face to match the gasket then blended back into the runner, and removed some in the area behind the valve guide it had a big hump

 

When I was doing the intake I told myself that I didnt want to cut into the rocker boss. I got a little carried away on the boss and went through(no biggie). There is a lot of material there to be removed but becareful not to go to thin. I have seen it to thin and the head actually rip apart with stiff springs and a nice cam.

If you go through dont panic just dont hog that area out. In fact if you look at most CNC port jobs they go in to the rocker boss also. just use some silicone when bolting the rocker down so oil wont get into the intake port.

Also try to make sure each port is as consistent to each other as possible.
You dont want 1 port flowing better than the rest.

 

thanks man!! i was looking at it and thought the same thing and im trying to get them to resemble some patriots that i saw first hand so i wasnt worried about cutting through a little bit.

 

I have about 75 pics of ported LS1 heads that I was collecting to get an idea of the shape I wanted. If you want them send me a PM with an email address and I will zip them and send them over to ya.

 

I wonder how they became pro's must have just awaken one mourning with all they needed to know about porting heads.

Anyway just do a little at a time dont go crazy and hog them out, bigger isnt always better. I know there use to be several DIY poting threads with some good pics on here. Good luck.

 

yep ive been reading all of those threads and looking at the pics i recieved from silver86. the 6" bit should be here today so maybe i can get back to toying with them

 

Lots of good info and pictures here: https://ls1tech.com/forums/generatio...ml#post4407860

 

Definetly a good link.

 

not much time but a little bit of progress here!!!