243 milled 59cc...cr ? lq4
06-10-2010, 02:12 PM
#21
Uhm, no your comment is a negative. For minor milling you can get away with just touching the deck surface of the heads. For severe milling such as being discussed here, you're going to run into issues with the intake manifold port alignment being proper. The only way to rectify it properly is to mill the intake port side of the head the same amount as the heads have been milled. This brings your geometry back to where it should be and your intake will fit as good as stock. Make sense?
06-10-2010, 02:45 PM
#23
Uhm, no your comment is a negative. For minor milling you can get away with just touching the deck surface of the heads. For severe milling such as being discussed here, you're going to run into issues with the intake manifold port alignment being proper. The only way to rectify it properly is to mill the intake port side of the head the same amount as the heads have been milled. This brings your geometry back to where it should be and your intake will fit as good as stock. Make sense?
06-10-2010, 09:59 PM
#24
For minor milling you can get away with just touching the deck surface of the heads. For severe milling such as being discussed here, you're going to run into issues with the intake manifold port alignment being proper. The only way to rectify it properly is to mill the intake port side of the head the same amount as the heads have been milled. This brings your geometry back to where it should be and your intake will fit as good as stock. Make sense?
06-11-2010, 09:31 AM
#26
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Are you guys cutting out the seats in these 862's and going to 2.0 valves?
Or are you studying under this guy? http://www.youtube.com/watch?v=Nlsf9AZbFEA
Or are you studying under this guy? http://www.youtube.com/watch?v=Nlsf9AZbFEA
Last edited by MPFD; 06-11-2010 at 09:44 AM.
06-11-2010, 11:47 AM
#28
Uhm, no your comment is a negative. For minor milling you can get away with just touching the deck surface of the heads. For severe milling such as being discussed here, you're going to run into issues with the intake manifold port alignment being proper. The only way to rectify it properly is to mill the intake port side of the head the same amount as the heads have been milled. This brings your geometry back to where it should be and your intake will fit as good as stock. Make sense?
I have seen in person people getting away with .050 mill, with no issues. 50+ is when the intake starts to bolt down funny, then the valves will touch the bores (5.3 block), and then the holes on the alternator have to be elongated
06-11-2010, 02:17 PM
#29
That's the problem, a lot of people don't do what they should. you should always check port alignment after milling a set of heads. You'd be surprised how much of a lip there is between where the intake manifold port and intake port of the head line up. This causes an obstruction of flow and turbulance. Next time one of you guys take your intake off your truck put some grease on your gaskets of your intake manifold then gently set it on your milled heads. Then remove the intake. You'll see the witness marks of the grease outlined around your intake ports. Now tell me how far it's off. Think of what you're missing out on by not having the intake side of your heads milled. That lip causes problems with smooth flow.