New Holley 4 bbl
Just purchased a 87 Minnie that the previous owner had a New Holley 4 bbl recently put on, went to get the rig smogged and the tech said it was running too rich and it didn't pass. When he did the H...
Forum Discussion
I've heard of intake manifold leaks on the 460. I guess any engine can have them but 460 has come up several times. There are easier things to do than replace one and the manifold is heavy enough that the manual recommends using a hoist.
But what I found ours was that the EGR "Plate" was seized to its studs and the gasket between it and the actual intake manifold was burned through. This was after I found the EGR Valve itself had rusted out and was causing a major vacuum leak. Then I got suspicious of the plate gasket when the plate wouldn't lift off the studs. One stud was rusted solid to the plate. That meant that tightening the nuts holding the carburetor down didn't tighten that corner of the plate. Cleaning it all up and installing new gaskets had it running quite a bit better. Along with a new EGR Valve of course. Our 460 was a 1983 and did not have a cat converter or O2 sensors.
But what I found ours was that the EGR "Plate" was seized to its studs and the gasket between it and the actual intake manifold was burned through. This was after I found the EGR Valve itself had rusted out and was causing a major vacuum leak. Then I got suspicious of the plate gasket when the plate wouldn't lift off the studs. One stud was rusted solid to the plate. That meant that tightening the nuts holding the carburetor down didn't tighten that corner of the plate. Cleaning it all up and installing new gaskets had it running quite a bit better. Along with a new EGR Valve of course. Our 460 was a 1983 and did not have a cat converter or O2 sensors.
