As my work truck rolls onto 625k km's, I'm thinking a head replacement in the future is coming. Being that I can't leave well enough alone,does anyone know who builds a good ported performance head for CR 5.9?
And what upgrades could be done for valves, springs etc?
I saw a flow # for the 5.9 head that shows 180 cfm on the intakes which seems kida wheezy. I imagine the porting is tough because part of the intake is part of the head.