I installed the Kill Devil Diesel O-ringed heads on mine when I did my bulletproofing with Studs etc. I was temped to do their Long block but mine was still in good condition. If I'm right it is only about $4k more than the Heads and studs and gaskets. Don't forget a new wiring harness while you are there. Good luck with the upgrade.
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2007 RB50 6.0 PSD Walker Evans Streetlocks, 305X70X17 Terra Grapplers Custom Aluminess Roof Rack, ETC ETC
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