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Seafoam did the trick with some help from a heavy duty wire I had.
On another note, every one of my intake bolts were either loose or barely snug, the front and back of my engine are covered in oil. There was so much oil covering both sides of the intake gasket, that I did not have to pry to take the intake off and the gasket just came right off.
So if your car is running poorly like mine, check the intake bolts to make sure they are bolted down correctly.
Seafoam did the trick with some help from a heavy duty wire I had.
On another note, every one of my intake bolts were either loose or barely snug, the front and back of my engine are covered in oil. There was so much oil covering both sides of the intake gasket, that I did not have to pry to take the intake off and the gasket just came right off.
So if your car is running poorly like mine, check the intake bolts to make sure they are bolted down correctly.
That is common. Probably the last intake R&R was not re-torqued after a heat cycle. I have never had to pry a LT1 intake off if it was leaking enough oil gets everywhere.
I took my intake to the car wash before I took it to a shop to get chemical cleaning, and also after I took it to a shop. Even after the shop cleaning, I got quite a bit of carbon out of the passages.
Put the hi-pressure wand in every passage - TB bores, temp sensor opening, 2 ports on passenger side, 3 EGR ports on the back, 2 PCV ports + another on the driver's side, and also ALL the bolt holes. Pull the baffle off the bottom, and go there too.
I would NOT use 'wash', rather 'rinse'. You can't dry out the ports, and soap is like gum when it dries - window tint glue, tire mounting, etc.