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Put up with the bad heads for nearly 2 years. It was stronger than ever after work was done and actually liked seeing how little carbon build up was despite lacking dual injection or those catch can systems. But alas, it was short lived. I did not even get to test it at a drag strip before the end. I was confident once launching was mastered, and good DA would have had me break into 11.9's. May another take its place! Good luck with yours hrlinc!

OK. Good.  Let us know if you get them working again.

I hold you to that because that is where I found it and you are correct about the overheat and melt - 1 terminal totally burnt....ty

Welcome to the forum and enjoy your MKZ.

Thanks for the responses. I will update on the new heads. Hopefully good enough to keep car long term. other voices tell me car is jinxed, move on. Too nice though. Can't wait to reapply Livernois tune and go faster in quarter mile:) Hrlinc