Hardened seats. So far no one has posted flow numbers to indicate that porting will really make much of a benefit. Also remember that right before the head is a intake manifold that is very restrictive. Porting the heads isn't going to get you very far with out somthing like the gogo intake.
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Exactly what I was talking about. It also comes with a built in egr delete and coolant reroute eliminating coolant from the intake all together. As for in creases? It has been said that 200* degrees were lost as well as better throttle response and very noticable difference in the higher rpm range. This all on a stock truck with tuning only. Factor the power max and it should get even better. The cost of the intake is about the same as a inter cooler and delivers the same gains in egt drop plus more airflow.You can do a three angel valve job bigger valves stronger spring but you would need this intake
GoGoDiesel Stage 1 Intake Manifold w/ EGR Delete The only true performance intake manifold on the market for the 6.0L powerstroke. [GGD-6LSTG1] - $1,200.00 : Direct Injection Performance - GoGoDiesel.Com, Your Source For All Things Diesel!
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