just milled my 292 cylinder head - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SnS C10 · 06-05-2015, 01:28 PM

Hey everyone just thought I would share. I brought my 292 straight 6 head into work today to just put in the parts washer. Well, as a machinist with my own shop I couldn't resist. I first checked the head for squareness and found it was about .004 out. So, I decided to mill the head down until it cleaned up which was about .005 depth and then I couldn't resist and took it down another .025 for a total of .030. Should give me a small bump in compression and give me a nice flat surface for my previously leaking head gasket. For anyone interested this was done with a 12 flute face mill. Cat 40 taper. On a sharp bed mill with power feed. 390 rpm and about 7 inches per min feed. .005 finish pass. Ill find out how it works in a few weeks...

SnS C10 · 06-05-2015, 01:32 PM

Couple pics

Shaky · 06-05-2015, 01:47 PM

Yeah - those inline heads like to warp a wee bit. I keep looking at those LPG pistons to bump the compression up a little too.

mattbert56 · 06-05-2015, 04:06 PM

You think with 2 passes she's guna stay flat? The shop I work in we face one of our products we make with an 8 flute facing bit and always end with a small step where the two a passes meet.

SnS C10 · 06-05-2015, 04:59 PM

No one said I did two passes. For your information I did 5 total passes. Last one was .005

SnS C10 · 06-05-2015, 05:01 PM

And afterwards I indicated the head from end to end, stylus did not move. Put on the granite square and also used a straight edge and its dead nuts now

Shaky · 06-05-2015, 05:33 PM

Gonna touch the manifold faces too?

SnS C10 · 06-05-2015, 05:53 PM

Shaky I did a cleanup on manifold face as well. Also put on a fresh coat of paint. Ready to get this thing installed and see how it runs

mattbert56 · 06-05-2015, 05:54 PM

Very nice! I didn't meen to soy d like I was being judgmental man. Sorry if it came across that way. Nice work again.

SnS C10 · 06-05-2015, 06:16 PM

No worries mattbert. Thanks for the comments

TJ's Chevy · 06-05-2015, 09:14 PM

Looks nice! Outta seal up well now. With the head shaved that much you should see about 8.5.1....maybe a little less. But you should feel a wee bit a difference anyhow. lol Have fun with it man. Heck since your a machinist you should put in bigger valves and lump ports.

GRX · 06-05-2015, 11:16 PM

Looks good. Don't forget new freeze plugs while you are at it. If I had a dollar for every one of these I have milled. Use to hate when customers brought in the integral heads. Don't see them much anymore which is fine by me.

06-05-2015, 01:28 PM	#1
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	just milled my 292 cylinder head Hey everyone just thought I would share. I brought my 292 straight 6 head into work today to just put in the parts washer. Well, as a machinist with my own shop I couldn't resist. I first checked the head for squareness and found it was about .004 out. So, I decided to mill the head down until it cleaned up which was about .005 depth and then I couldn't resist and took it down another .025 for a total of .030. Should give me a small bump in compression and give me a nice flat surface for my previously leaking head gasket. For anyone interested this was done with a 12 flute face mill. Cat 40 taper. On a sharp bed mill with power feed. 390 rpm and about 7 inches per min feed. .005 finish pass. Ill find out how it works in a few weeks...

06-05-2015, 01:32 PM	#2
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	Re: just milled my 292 cylinder head Couple pics Attached Images

06-05-2015, 01:47 PM	#3
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: just milled my 292 cylinder head Yeah - those inline heads like to warp a wee bit. I keep looking at those LPG pistons to bump the compression up a little too. __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

06-05-2015, 04:06 PM	#4
mattbert56 Registered User Join Date: Mar 2013 Location: Story, Wyoming Posts: 641	Re: just milled my 292 cylinder head You think with 2 passes she's guna stay flat? The shop I work in we face one of our products we make with an 8 flute facing bit and always end with a small step where the two a passes meet. __________________ Well that didn't go as planned. 1965 k20 buikd thread: http://67-72chevytrucks.com/vboard/s...=628346&page=6

06-05-2015, 04:59 PM	#5
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	Re: just milled my 292 cylinder head No one said I did two passes. For your information I did 5 total passes. Last one was .005

06-05-2015, 05:01 PM	#6
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	Re: just milled my 292 cylinder head And afterwards I indicated the head from end to end, stylus did not move. Put on the granite square and also used a straight edge and its dead nuts now

06-05-2015, 05:33 PM	#7
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: just milled my 292 cylinder head Gonna touch the manifold faces too? __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

06-05-2015, 05:53 PM	#8
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	Re: just milled my 292 cylinder head Shaky I did a cleanup on manifold face as well. Also put on a fresh coat of paint. Ready to get this thing installed and see how it runs

06-05-2015, 05:54 PM	#9
mattbert56 Registered User Join Date: Mar 2013 Location: Story, Wyoming Posts: 641	Re: just milled my 292 cylinder head Very nice! I didn't meen to soy d like I was being judgmental man. Sorry if it came across that way. Nice work again. __________________ Well that didn't go as planned. 1965 k20 buikd thread: http://67-72chevytrucks.com/vboard/s...=628346&page=6

06-05-2015, 06:16 PM	#10
SnS C10 Registered User Join Date: Jul 2004 Location: Lomita, Ca Posts: 1,225	Re: just milled my 292 cylinder head No worries mattbert. Thanks for the comments

06-05-2015, 09:14 PM	#11
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: just milled my 292 cylinder head Looks nice! Outta seal up well now. With the head shaved that much you should see about 8.5.1....maybe a little less. But you should feel a wee bit a difference anyhow. lol Have fun with it man. Heck since your a machinist you should put in bigger valves and lump ports. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

06-05-2015, 11:16 PM	#12
GRX Registered User Join Date: Jul 2010 Location: MD Posts: 1,937	Re: just milled my 292 cylinder head Looks good. Don't forget new freeze plugs while you are at it. If I had a dollar for every one of these I have milled. Use to hate when customers brought in the integral heads. Don't see them much anymore which is fine by me.



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