Heads milled, intake no longer fits...
09-07-2012, 09:47 PM
#1
TECH Fanatic
Thread Starter
iTrader: (6)
Join Date: Oct 2007
Location: Central Valley, CA
Posts: 1,119
Likes: 0
Received 0 Likes
on
0 Posts
Heads milled, intake no longer fits... https://ls1tech.com/forums/generatio...nger-fits.html
Sorry for the duplicate post but I am in need of some help...thanks
Sorry for the duplicate post but I am in need of some help...thanks
09-07-2012, 10:16 PM
#2
I never had this problem, but I've heard of people needing to egg the bolt holes out in the intake to get it to bolt up after heavy milling....also before you do any grinding on the bolt holes make sure its not the intake bottoming out on the coolant crossover tubes
09-07-2012, 10:26 PM
#4
First then I'd pull the bolts out and get a long drill bit just hair larger than your holes in the intake and try drilling them out....then just for peice of mind after everything is done rub a thin coat of Gasket maker on the O ring gaskets when you bolt it down
09-08-2012, 01:42 AM
#6
Spot facing, chasing, and usually if you're running into these extreme milling circumstances it is also customary to mill the exhaust face back to proper squaring in order to gain back proper exhaust header clearance around motor mounts, uppers, transmissions, and frames.
09-08-2012, 02:03 AM
#7
do not use any kind of sealant around O-ring style gaskets. they are designed to move as the intake and heads will heat at different rates because of the different material they are made from.
Trending Topics
09-08-2012, 04:08 AM
#8
Teching In
iTrader: (18)
Join Date: Jan 2010
Location: rhode island
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Here's my advice.. just like bmw3588 said, any time heads are going to be heavilly milled you will need to mill the intake side of the heads also for proper intake alignment.
For my first and current build i had my afr 205's taken down from 66cc to 60cc. I asked on here before i took them down if i should be milling the intake side too as this isn't discussed very much. Was basically told i would be borderline with my bolt holes lineing up on my fast 92. Not really what i wanted to hear as this doubled the cost of the machine work. (You may be able to get the intake to bolt down by elongating the intake holes as some have suggested but i wouldn't do this. it's still going to be a tight squeeze between the heads.) Once i got my heads back and on the motor i test fitted my intake and everything lines up perfectly. The exhaust surface wasen't touched but i personally don't think the heads sitting .036 lower is going to give my headders any clearance issues.
As for the intake port gaskets the only thing you should do is run a light film of oil on them to help them seal, nothing else should touch them.
For my first and current build i had my afr 205's taken down from 66cc to 60cc. I asked on here before i took them down if i should be milling the intake side too as this isn't discussed very much. Was basically told i would be borderline with my bolt holes lineing up on my fast 92. Not really what i wanted to hear as this doubled the cost of the machine work. (You may be able to get the intake to bolt down by elongating the intake holes as some have suggested but i wouldn't do this. it's still going to be a tight squeeze between the heads.) Once i got my heads back and on the motor i test fitted my intake and everything lines up perfectly. The exhaust surface wasen't touched but i personally don't think the heads sitting .036 lower is going to give my headders any clearance issues.
As for the intake port gaskets the only thing you should do is run a light film of oil on them to help them seal, nothing else should touch them.
09-08-2012, 04:14 AM
#9
TECH Enthusiast
I had my heads milled 0.060, and to get my intake back on what I had to do was file the outside edges of the bosses on the intake manifold where the 10 intake bolts come though. You know on the underside of the intake where it mates with the head intake port surface. 2 of the bosses have brass inserts and take a little more work than the others. I just had to take about 0.030 off of each outer edge, and the manifold pulled down in place through the torque sequence.
03-24-2019, 11:47 PM
#14
Teching In
Join Date: Jul 2016
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
Bringing this back from the dead, sorry, not sorry, I'm desperate. When you say outside of the edges, do you mean pointing towards the center of the intake? My heads have been milled and I cannot get my intake to seal. Hopefully you even remember doing this.
03-26-2019, 06:36 AM
#15
"he exhaust surface wasen't touched but i personally don't think the heads sitting .036 lower is going to give my headders any clearance issues."
Only if the heads were flat milled. Removing large amts of chamber requires angle milling, and that WILL change the exh flange angle.
Only if the heads were flat milled. Removing large amts of chamber requires angle milling, and that WILL change the exh flange angle.
03-26-2019, 07:18 AM
#16
TECH Fanatic
Heads were milled .040” total, LS3 stock heads. Intake wouldn’t sure down all the way. Angle was fine, so I gutted the plastic ribs on the bottom of the intake. I don’t know what you’re running but yes, had this problem before and it’s now back together and running fine. Has been for over a year.
https://ls1tech.com/forums/generatio...-problems.html
https://ls1tech.com/forums/generatio...-problems.html
