Port & Polish Intake
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By crazy chance I do. :laughing:
These are photos of the plenum, runners and intake manifold. Not the best but I think you'll see enough to get the idea of what I did. Tools used were a Dremel and air powered die grinder. I used the die grinder for most of the job. The first step I took was cut out the center portion of the plenum/runner/manifold gaskets, siameseing them. There is an embossed portion on those gaskets. I trimmed the access paper that was to the inside of the embossed part, in essence making the hole larger. I then traced the outline of the gasket on the plenum, runners and intake manifold. Below I am pointing to the embossed part of the gasket.
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You can see in this photo some of the black marker on the plenum. This is the shape the gasket took when I cut it down. I cut the part until all the marker was gone. Of course I wasn't done yet when I took the photo.
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Another image of the plenum shows the "after" version when I chopped off the 2 ledges that were inside the TB opening. I also opened up the bores just a little and cleaned up some of the sides. You can see where I ported by the shiny look. If you look deeper into the plenum you can see where it's darker, not touched.
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The runners were a different animal. You can only cut so deep. If you go too deep you'll break through the flange.
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I think the "1/4" in this next photo means I only went 1/4 in. deep on those cuts.
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So far you can see in those, and the following photos, that I didn't get very far in polishing the inside of the runners. I tore up a lot of tapered cartrige rolls trying to get as deep as possible. I probably could have found something to get all the way through but at this point in time I was w/o my Vette for a few months and it was time to get it put back together. The Vette was in the shop for a head gasket replacement that turned into a cam swap, gear change...etc. :laughing:
In these photos, hopefully you can see the cut I made between the runners in the intake manifold. I siamesed those and cut it down about an inch or so. I used to have all the measurements but not anymore.
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The part of the intake manifold that mates to the head I touched up. I don't recall messing around in that area too much.
Now I will say this, I did not dyno or get track times after doing this job. Even if I did, it would be hard to tell if I had any gains from it due to the amount of "other" work that was done at the time. I can firmly say that it did allow the motor to "pull" at a higher rpm. I was still feeling it pull into the 5k rpm range. I don't know that it would matter much w/ the stock cam. I had installed the hotcam before I got this put back on the motor.
Hope this helped,
John
These are photos of the plenum, runners and intake manifold. Not the best but I think you'll see enough to get the idea of what I did. Tools used were a Dremel and air powered die grinder. I used the die grinder for most of the job. The first step I took was cut out the center portion of the plenum/runner/manifold gaskets, siameseing them. There is an embossed portion on those gaskets. I trimmed the access paper that was to the inside of the embossed part, in essence making the hole larger. I then traced the outline of the gasket on the plenum, runners and intake manifold. Below I am pointing to the embossed part of the gasket.
You can see in this photo some of the black marker on the plenum. This is the shape the gasket took when I cut it down. I cut the part until all the marker was gone. Of course I wasn't done yet when I took the photo.
Another image of the plenum shows the "after" version when I chopped off the 2 ledges that were inside the TB opening. I also opened up the bores just a little and cleaned up some of the sides. You can see where I ported by the shiny look. If you look deeper into the plenum you can see where it's darker, not touched.
The runners were a different animal. You can only cut so deep. If you go too deep you'll break through the flange.
I think the "1/4" in this next photo means I only went 1/4 in. deep on those cuts.
So far you can see in those, and the following photos, that I didn't get very far in polishing the inside of the runners. I tore up a lot of tapered cartrige rolls trying to get as deep as possible. I probably could have found something to get all the way through but at this point in time I was w/o my Vette for a few months and it was time to get it put back together. The Vette was in the shop for a head gasket replacement that turned into a cam swap, gear change...etc.
:laughing: In these photos, hopefully you can see the cut I made between the runners in the intake manifold. I siamesed those and cut it down about an inch or so. I used to have all the measurements but not anymore.
The part of the intake manifold that mates to the head I touched up. I don't recall messing around in that area too much.
Now I will say this, I did not dyno or get track times after doing this job. Even if I did, it would be hard to tell if I had any gains from it due to the amount of "other" work that was done at the time. I can firmly say that it did allow the motor to "pull" at a higher rpm. I was still feeling it pull into the 5k rpm range. I don't know that it would matter much w/ the stock cam. I had installed the hotcam before I got this put back on the motor.
Hope this helped,
John
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541 Posts
Yup Thats my new baby. Unfortunat that the previous owner didnt tell me That the park does not work. Good things is that is was a hair away from hitting my truck And nothing happened to the vette Either. plus thats The only picture i got right now.
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7,068 Posts
You could clean up the front of the plenum where the TB attaches and not touch the runners. It wouldn't make sense to port and siamese the plenum w/o doing the runners. You could also port/siamese the plenum and the side of the runners that connect to the plenum and not do the intake base. I did a search on this and grumpyvette said siamesing the base will cost you torque. Here's the link, it's a good read.
Porting a TPI
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7,092 Posts
Great find John. I had almost forgot about Grumpy's post about that. :thumbsup:
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