Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Yes, the manifolds can be removed in the car. First, will need to spray the lwr studs & nuts with a good penetrating oil. Next, the AC compressor can then be loosened & removed from its mounting large alum bracket, lwr bracket, & rear brace. The compressor can stay hooked up to the lines, but it will need to be loosened & very carefully slid over & set on a slope on an old thick towel on the passenger side inner fender (expect to have to strap it outboard). The inner AC box cover may need to be carefully removed as well to reach the rear ex manifold bolt head. On the drivers side, good chance will have to remove the steering column intermediate shaft. On the bolts attaching the ex manifolds to the heads, examine the bolt heads to see if the original stamped steel tab type ex manifold bolt locks are in place. If so, the tabs will need to pried back so a 6 point 9/16" socket & 6 point box wrench end wrench can be firmly attached to the bolt heads .I usually rapp the bolt heads with a large ball peen hammer, this helps jar the threads. Having pulled literally hundreds on Pontiac V8 heads, using this method, have broken next to no exhaust manifold bolts. Being careful, it's an afternoon job with hand tools.