O-ringed head? | Ford Power Stroke Nation
What is an O ring head and why is it good? What about putting hardened Valve seats in per the article in Diesel Power going through how Bulletproof did a build up 2007 Lariat CC/SB SRW 6.0L 2" Icon Leveling Lift, Rancho 9000 Shocks, Roadmaster Rear Anti Sway Bar, Airlift Airbags with Wireless Remote, Kuhmo 265/70 19.5 with Rickson …