Here's an old write-up I did a few years ago when I P&P my H23. I've also linked a thread from another forum I'm on that covers alot of this showing examples from myself and a few other members.
This is my how to on removing the casting mark edges on the intake and exhaust ports. It'll help the flow some but a good valve job will help you feel the real benefits from this. N/E how this is how I do it. If n/e one has some additional info to add feel free to.
Here's what you'll need to do this:
Intake Manifold Gasket
Magic Marker (any color that stands out)
Dremel or similar tool for grinding
Carbide Bit ( I just use the coarse sanding drums)
Step 1: Clean off the intake and exhaust flange surface on the cylinder head.
Step 2: Install gasket onto studs
Step 3: Once the gasket is secured in place take the marker and trace where there is still metal showing within the ports.
Step 4: Once you have marked the ports, it should look something like this.
Step 5: Take your Dremel or whatever tool you are using and start removing the material inside the port until you have ground away the material that was marked.
Here is what it should look like once you are done. I only had enough sanding drums for 3 ports so I'll post up the completed intake side once I am done. After my friend drops off the intake plenum I'll also add how to port match the IM to the head and the TB to the IM. It's basically the same as this but there are a few differences.
I hope this helps. If ya'll have any questions or comments feel free to chime in. This covers most of it but to see the full gains, I recommend getting a valve job and oversized valves depending on the application. You also should not go too crazy w/ the porting otherwise the intake charge will lose velocity.
The finished intake ports:
Here's the thread I mentioned.
http://d-series.org/forums/showthread.php?t=104314
This is my how to on removing the casting mark edges on the intake and exhaust ports. It'll help the flow some but a good valve job will help you feel the real benefits from this. N/E how this is how I do it. If n/e one has some additional info to add feel free to.
Here's what you'll need to do this:
Intake Manifold Gasket
Magic Marker (any color that stands out)
Dremel or similar tool for grinding
Carbide Bit ( I just use the coarse sanding drums)
Step 1: Clean off the intake and exhaust flange surface on the cylinder head.
Step 2: Install gasket onto studs
Step 3: Once the gasket is secured in place take the marker and trace where there is still metal showing within the ports.
Step 4: Once you have marked the ports, it should look something like this.
Step 5: Take your Dremel or whatever tool you are using and start removing the material inside the port until you have ground away the material that was marked.
Here is what it should look like once you are done. I only had enough sanding drums for 3 ports so I'll post up the completed intake side once I am done. After my friend drops off the intake plenum I'll also add how to port match the IM to the head and the TB to the IM. It's basically the same as this but there are a few differences.
I hope this helps. If ya'll have any questions or comments feel free to chime in. This covers most of it but to see the full gains, I recommend getting a valve job and oversized valves depending on the application. You also should not go too crazy w/ the porting otherwise the intake charge will lose velocity.
The finished intake ports:
Here's the thread I mentioned.
http://d-series.org/forums/showthread.php?t=104314
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