Dreaded 460 Exhaust Manifold Leak
Well I have the dreaded "tap tap tap" noise that pretty much guarantees an exhaust leak. More or less making this post to vent and to get tips from anyone who has done this before... At least the no...
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Thru very costly trial and error..I can tell you how to fix that manifold properly.
The engine was not built with manifold gaskets so reverting to them is just going to allow the warping/tapping to recur.
Once you have the manifold off, have it resurfaced properly then install it without gaskets. Torque to it's proper point..start it and let it warm up. Shut it down for 24 hrs..let it coool....no cheating. In the morning, re-torque again..start and let it come up to temp..shut down and let'r sit 24..hrs..re-torque,.repeat this 5 time..5 days. That will have your manifold seated properly and no gasket troubles 2 or 3 yrs down the road.
Gary Haupt
The engine was not built with manifold gaskets so reverting to them is just going to allow the warping/tapping to recur.
Once you have the manifold off, have it resurfaced properly then install it without gaskets. Torque to it's proper point..start it and let it warm up. Shut it down for 24 hrs..let it coool....no cheating. In the morning, re-torque again..start and let it come up to temp..shut down and let'r sit 24..hrs..re-torque,.repeat this 5 time..5 days. That will have your manifold seated properly and no gasket troubles 2 or 3 yrs down the road.
Gary Haupt
