Does anyone know where I can buy a Marine/high performance intake manifold for a 5.7L 350 vortec for a 98 c1500. What do you guys recommend? Does any one know the part number?

 

Hit the drop-down here and select "Intake Manifold and Fuel Rail"

http://mercruiserparts.stemtostern.c...er=809955%2097

 

Thanks James B. What happens if I decide to install the new intake, would i still need the egr valve?

 

Well, you don't "need" the EGR. You'll need to tune it out if you do not want codes. There is some fabrication involved if you want to retain EGR. Basically, it would require a divorced EGR mount like the Gen-III trucks used to have, and a custom braket and plumbing modifications to work. Mine's like that and works flawlessly.