Milling intake face of heads

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Mar 6, 2014 | 08:58 PM

mchicia1

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Milling intake face of heads

I am taking my ls3 heads down another .030" while they're off. They're already cut .030", so I am going to have the intake faces milled to correct intake manifold alignment.

Do you cut the intake face at a 1:1 ratio to how much you milled?

Mar 6, 2014 | 10:49 PM

ls1 1990 VN

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From: Auckland, Nth Is, New Zealand.

Good luck with P/V clearance but guess you know what you've got to play with.
Sorry can't help on the manifold

Mar 7, 2014 | 01:18 AM

bigfatls6

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WOW .060 off of a head. How much deck will be left on those heads?

Mar 7, 2014 | 08:20 AM

mchicia1

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Quote:

Originally Posted by ls1 1990 VN

Good luck with P/V clearance but guess you know what you've got to play with.
Sorry can't help on the manifold

I have Wiseco -3.2cc pistons. I'm going to clay before I take the heads to the machine shop. The reliefs on the Wisecos are massive. Very deep and very wide. They accommodate up to an ls3 sized valve.

Last edited by mchicia1; Mar 7, 2014 at 08:26 AM.

Mar 7, 2014 | 08:21 AM

mchicia1

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Quote:

Originally Posted by bigfatls6

WOW .060 off of a head. How much deck will be left on those heads?

People do it all the time, I'm not too worried about it.

AI even offers ls3 heads @ 60ccs. 60cc is a .050"-.060" mill.

http://www.advancedinduction.com/LSX...21GMPRHead.php

Last edited by mchicia1; Mar 7, 2014 at 08:48 AM.

Mar 7, 2014 | 08:56 AM

DietCoke

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yeah, ive seen ls3 heads with 100 off of them, lol.

Mar 7, 2014 | 09:01 AM

mchicia1

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So, mill .030", then mill intake side .030" too or ???? I don't know the angle the heads sit at, so I can't calculate it. Just wondering what people normally do.

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Mar 7, 2014 | 10:59 AM

mchicia1

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Quote:

Originally Posted by bozzhawg

Its done all the time.

Yep. I need new pushrods anyway, so I figured may as well.

11:1 comp should work much better with these huge heads.

Mar 7, 2014 | 11:56 AM

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speer13

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from an old chevy book.... should work but as others said check the machine shop...I believe a little more comes off the intake than the head

Intake Surface Mill Proportion = .707 ÷ (SIN (45 - intake face angle))

Mar 7, 2014 | 12:58 PM

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Russ K

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How much is that going to reduce the head flow? What about the ptv clearance? I think that you would need to angle mill, as the intake valve seat might be in the way.

Russ Kemp

Mar 7, 2014 | 01:37 PM

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mchicia1

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These heads already flow too much for a 347. The wiseco valve reliefs are like .250 deep or something absurd. I highly doubt it would even get close to the intake seat milling .060.

Anyway, I'm thinking about just bolting them back on now. Apparently it isn't that easy to find a machine shop that will be able to mill the intake side and I don't want to mill the intake manifold because then it won't work on non milled heads and would be tough to sell.

Last edited by mchicia1; Mar 7, 2014 at 01:46 PM.

Mar 7, 2014 | 05:38 PM

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Hardcoresoldier

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I'm having my CNC LS3 heads milled .036 to get 64cc chambers. Weisco pistons with 8cc dished with LS2 valve reliefs. Having them enlarged for LS3 valves. Gotta mill them, not wanting 10:1 compression....No intention of milling the intake.