This is a follow up to my post Questions about swapping a L36 plastic UIM to L26 alloy. I've gone through 4 different plumbing configurations for the PCV air inlet (on top left of UIM). The first one was a total bust, didn't work correctly. The second one worked briefly but the parts I used split or leaked air. The third configuration worked perfectly, but I didn't like how it looked. The fourth and final one, works perfectly and looks great.
This is the original setup. Do not repeat this mistake.
This was the second attempt. I used plastic tubing and fuel line for the vacuum tubing. For whatever reason, real vacuum tubing cannot be found in the Atlanta area.
This was the third attempt. I ordered an expensive silicone vacuum elbow and some HPS High Temp Silicone vacuum tubing. It worked great. I just didn't like the look.
And finally, I ordered the stock L26 vacuum tube that would have been on a Series III engine. GM part #12596451.
I cut the off the end that goes into the intake tube grommet.
And in place. The "bumps" that are left on the cut off end makes a perfect barb end for the vacuum tube. Only 2 parts required, no clamps. Nice and clean looking— like a factory setup (my goal).
I'm finally completely happy with my new setup. However, I neither recommend or discourage this mod. I don't believe it adds anything to the power, mid-range throttle response is pretty good (maybe no more than just cleaning the throttle body would get you), has a bit raspier sound (metal vs. plastic?) and didn't seem to effect the fuel mileage.
