Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
Re: Intake Vacuum leaks?
Yup, not one of us know anything about fat block Chevy engines, all I ever did with them was fix them after the experts made them work worse, work directly with Duntov at Chevrolet Skunk Works on engine development, and drag race a blown, injected nitro 605 inch one in an AA/Fuel Altered. Makes me dumb as a box of rocks about fat block Chevy engines.
Why not simply put the 4 bolts into the holes and tighten them up, that usually cures leaks at those 4 points. Worth a try, and no pulling the manifold back off if it works.
BTW, best way to find an air leak is to flow a low volume of UNLIT propane around a suspect leak. Engine will perk up a touch, exhaust will smell different, and NO residue on engine parts.