Question about Holley alum. intake manifold
The "hole" you describe is where the MAP sensor will need to be switched over from your LS6 intake. There is no provision on the Holley for the small vac line that controls the A/C vents - I "T'ed" mine into the EVAP return line before the purge solenoid.
Buy a 4 foot section of 3/8" fuel line to make a new brake booster hose - the stocker won't quite fit.
Other than that it should bolt right up with the supplied bolts (don't use the stock bolts). You'll (duh) also have to swap over your throttle cable mount and fuel rails/injectors.
I bought a new gasket set and use red loctite to seal the bolts on the bottom plate. Make sure that bottom plate makes a good seal, I lined the gasket with RTV. Line the intake gaskets up with the top of the machined groove in the head - if they slip down during install they can block the injector spray path.
Here are some pics :
http://www.geocities.com/badass30th/intake.html
Good luck,
Bad30th


