to angle mill or not to angle ill? that is the question
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Staging Lane
Joined: Nov 2001
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From: Carthage TX.
to angle mill or not to angle ill? that is the question should i angle mill my heads or leave them stock compression with spray, and what ccs" should i do my combustion chamber for 202 and 155s' any help would be greatly appreciated, thanks <img src="images/icons/confused.gif" border="0">
TECH Fanatic
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From: SW Florida
Re: to angle mill or not to angle ill? that is the question I may be wrong, but I believe most, if not all the LS1 head porters just flat-mill the heads.
I think you will find that "angle" milling the heads is not necesary when only taking .030" or so off the head surface. That amount of material posses no alignment problems between the mateing surfaces of the head and intake manifold on the LS1.
Ron,
I think you will find that "angle" milling the heads is not necesary when only taking .030" or so off the head surface. That amount of material posses no alignment problems between the mateing surfaces of the head and intake manifold on the LS1.
Ron,
Re: to angle mill or not to angle ill? that is the question My JPR S-1 heads are angle milled and the compression bump was only to 10.4. <img src="images/icons/smile.gif" border="0">
While we're at it, can you explain how angle milling is done and why, if at all, it is better than flat milling?
While we're at it, can you explain how angle milling is done and why, if at all, it is better than flat milling?
Re: to angle mill or not to angle ill? that is the question A flat mill takes a cut off the combustion chamber side of the head. An angle mill takes another cut off the intake port side of the head to compensate for the angle change in the intake manifold to intake port (caused by the flat mill)
TECH Apprentice
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From: Williamsburg, VA
Re: to angle mill or not to angle ill? that is the question As I understand the concept of angle milling the heads, it is to create a greater reduction in the chamber volume without lowering the intake ports relative to the intake manifold.
TECH Resident
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From: Chattanooga,Tn
Re: to angle mill or not to angle ill? that is the question it takes and uneven cut on the head face with more of the cut on the exhaust side and less on the intake side a 0-.030 cut would not make that much of a difference. After doing and angle mill the intake face is also required to be cut to keep the surfaces at the same angle they were at before.
It also tends to stand the valve up (more upright) in the chamber,which can make more power due to a small unshrouding of the valve and the fact that the air doesnt have to make as sharp of a turn when entering the combustion chamber .
Mostly Angle milling is done when more than .050 is cut from a head.The downfall on an ls-1 would be that the intake gasket is attached to the intake therfore if not done perfectly the O-ring wouldnt seal. and you wouldnt have the option to use 2 intake gaskets like a convention intake manifold.
It also tends to stand the valve up (more upright) in the chamber,which can make more power due to a small unshrouding of the valve and the fact that the air doesnt have to make as sharp of a turn when entering the combustion chamber .
Mostly Angle milling is done when more than .050 is cut from a head.The downfall on an ls-1 would be that the intake gasket is attached to the intake therfore if not done perfectly the O-ring wouldnt seal. and you wouldnt have the option to use 2 intake gaskets like a convention intake manifold.
