Jason...don't forget the coolant elbow.

ok, i got the manifold coming, ordered the gaskits and elbow, got a t-stat coming, now i just gotta get some coolant and print the torque specs from alldata and Im good to go...after i visit the machine shop...thanks for the info

Jason, I mis-stated the size you will need for the APN pipe to fit your LIM. You will need to have the machinist turn the base of the APN pipe down from .750" to .625" with a chamfer at the very bottom. The LIM bore in 99+ L36 engines is .625". So, a .625" base outside diameter should give a nice interference fit. I edited my earlier post in this thread to correct my error. Sorry about that.

now if i can the the manifold in by friday, then i'll drop the pipe to the machine shop and do everything this weekend...one more quick question...do you use the rubber endpieces with rtv on the corners or just use a thick bead of rtv and scrap the endpieces...on chevy 5.7'* and 4.3'* i've always ditched the endpieces and used a nice thick bead of rtv...do you do the same on 3.8'*

I use RTV in the corners only because I want to be able to remove mine and re-use them if I need to go in again. So, mine will seep some oil after about a year. Jr's3800 runs a thin bead of RTV all along the end pieces and his stay dry.

I run a 160 in indiana right now...doesnt bother me...its personal choice I guess

my factory one is a 195 and i just bought a 180, but i'm gonna drill the factory one when i get the manifold off and put the 180 in in the spring

now the ac compressor clutch is junk in the car...seems funny how all these things go wrong just after the warenty expires

just got done replacing the lower intake gaskits...only had 1 problem...i took the revised stovepipe that came with the apn upper intake and they took way too much off, does anyone have an extra that i can buy...i used the old one for now but it will only take a few min to change it,

now i have to wash the car cause the fender covers wiped off al the salt so it looks really messed up now...lol

If you didn't destroy it taking it out, you can use your stock GM .625 pipe. It will only give you a .065" gap but you now have a heat shield in the upper, and that will work well enough (better than a factory new 99) until you can find a Dorman pipe from someone who fixed an earlier model than yours. How small did they turn the base?