My 427SR/TW was using
oil from the get go......Working with Roush Engineering and Warranty and a straight shooting and technically savvy mechanic who is authorized to do Roush warranty work ( Voss Performance ) we acquired new heads. That was 7000 miles ago with no further oily plugs and constant top offs. They covered the new AFR Heads under existing warranty. We could have replaced them with the engine in place ,but I felt doing it on an engine stand was less risk. I paid for the engine removal and installation. Voss gave me a COCOA-OC discount on his labor. With the help of Voss we were able to avoid crating the engine back to Michigan. We sent boroscope and photo evidence and requested an ok to pull the intake manifold. Additional photos followed, and we had new heads being shipped to Ca.....They had switched to Dart heads, however my piston configuration was incompatible with the Darts so I have AFR's again. Long process. Big manufactures have Technical and Warranty Committees.......In addition Voss has had great success in working out the issues with the Roush EFI system. SoCal owners take note.