just a quick question. i got my 98 NPI slug. gonna buy a used PI intake. what all do i need. and no im not using plates cause im down with good ol rtv.
Either or. I used NPI, most people say PI, they all work the same IMO (give me 5 years and maybe I'll say differently?) The PI gaskets will require RTV around the coolant passages, the NPI gaskets require RTV around the intake passages.
intake, PI gaskets, rtv silicone, alternator bracket (unless you have the NPI "fix" manifold, then you can reuse the crossover and bracket), water pump o-ring and nipple, coolant runner (the thing that goes under the intake in the block valley). that should be everything. It'd probably be a good idea to replace your egr gasket at the same time too, unless that is deleted. Ask randy s and he'll hook you up with a great price on everything.