1990 454 Chevy exhaust manifolds
Hey all - old problem, new situation. Our 1991 YellieBelle has ~21,000 miles on her, we got her last year with ~18,000 on her. When I got her running (hose on internal gas tank mounted fuel pump doesn't like alchohol in gas), I could hear the tale, tale, tock-tick-tick until she warmed up. Ole right side bank, #8 cylinder.
It's not really that bad - but I know leaving it alone will be cause for more extensive work later.
Like I said, it's really not that bad - so after having recently tearing the hydroboost and radiator out (installed rebuilt hydraboost, had rotted radiator recored) - I think fixing the exhaust manifold leak is next on the list.
So - looking for ideas. Should I -
1. Just (hopefully) retorque the manifold bolts, and if I break one then pull the manifold? Should I PB Blaster or Kroil the bolts first?
2. Go ahead and Kroil or PB Blaster the bolts first, then retorque, or go ahead and pull the manifold off to make sure all mating surfaces are clean, then reinstall using a high temp sealant on mating surfaces, as well as some type of thread sealant on the bolts (for easier future removal, provided I have to do this again)?
3. Just switch to tube headers? TO include or not include new muffler/cat (these were built with muffler in front of cat)?
4. Should I do the same to the left bank that I do to the right bank? (FYI- I will be fabricating the right side splash shield that helps to insure air is drawn past the right side exhaust bank before exiting the wheel well i.e GM p/n 15983041. The left bank shield is still there).
Appreciative in advance of anyone's experience!