installing apn header with 99+ intake had some questions about the write up.
does the doughnut need to be replaced? if so where do you get it/how much? As cheap as it is, go ahead and replace it, they should be under $5 at your local parts store. Also take a look at the header you are putting on, if it is aftermarket, some of them dont use the stock type doughnut.
some people say to use antiseize and others locktite, seems contradicting whats better?
Blue locktite on the head bolts to keep them from backing out. They are not getting torqued to very much, like 23 lbs max, so they will try to back out over time with the motor vibes. Use antisize on the doughnut or colector bolts if you want, will make it easier for next time you have to replace the doughnut.
does the auto parts store know what bolts you need or could someone tell me? If you read the very beginning of this post, you will read what size the bolts are in what thread, pitch, and length.
i've heard mixed responses on these two manifolds fitting, some say you need to grind, others say it fits anyone know for sure? Depending on what your intake looks like, how the header was stamped, and how you align things makes a difference too. I have had stock headers going from one motor to anouther not want to fit between the intake ports. Just take your time and lay it all out on the bench. If you have to grind on anything, do it on the header. You should not have to grind very much if any at all.
(98 4.0L HO) Make sure you remove your power steering pump from the front of the intake, just set it where the air box you removed was. This will save you alot of time and effort. Get your self an fsm, it will give you all the torque specs and order.