I still don't know why GM designed this intake manifold the way they did, but today, we're gonna fix it permanently, and the right way. When we're done, we should have a bump of about 20 horsepower, and eliminate some problematic issues with the PCV system. However, there's a good chance we might ruin this intake manifold (inadvertently) as part of the process. In the name of power and speed, we're cutting apart a perfectly good intake manifold in hopes of making it even better, but if we can't weld it back together, we'll be out of luck.

my temporary PCV fix on this manifold last year
   • this is the WORST ENGINE DESIGN I've ...  

Check out Raylar for 8.1 parts. he can do the same modify a stock intake or you can purchase the Gen7R intake as well.
https://www.raylarengineering.com/int...