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Old 10-12-2004, 03:07 PM
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Affect of head milling on volume?

Starting w/ say a set of Chevy SB 76cc cast iron heads - if they were given a 'typical' nominal milling to clean them up - how much might it take away from the 76 cc chamber volume? End up w/ 74 ccs total? Less? Just looking to get an approximate idea not anything at the extremes.

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Old 10-12-2004, 03:26 PM
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A good ballpark figure for the SBC is .007" per CC.

tom
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Old 10-12-2004, 03:36 PM
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Quote:
Originally posted by machine shop tom
A good ballpark figure for the SBC is .007" per CC.

tom
how about on sbf heads?
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Old 10-12-2004, 03:54 PM
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It would be about the same. Same style of chamber, cc's about the same.

tom
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Old 10-12-2004, 05:03 PM
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thanks!

How many thousands would be typical to see removed in a typical 25 or 30 yr old SBC cast iron head that is basically 'tired' but nothing seriously wrong w/ it (e.g. no leaking head gasket or warped heads)
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Old 10-12-2004, 07:57 PM
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This did not come out as on the chart. If you want it please send me your email address in a PM and I will send the folder.
George

Head Milling vs. Compression
Where you need to machine the port side of the intake as well as the front and rear so you get proper sealing. Now you will know.


Engine/Head Type
Amount to mill to reduce chamber volume by 1cc
Proper amount to mill port sides of intake for correct alignment and sealing for each .010 removed the on heads or block
Proper amount needed to mill intake ends for correct alignment and sealing for each .010 removed on the heads or block

first is set of #s are Amount to mill to reduce chamber volume by 1cc

Second is Proper amount to mill port sides of intake for correct alignment and sealing for each .010 removed the on heads or block

3rd #is Proper amount needed to mill intake ends for correct alignment and sealing for each .010 removed on the heads or block

SBC 64cc chamber .0055 .0123 .0173
SBC 76cc chamber .0059 .0123 not required
BBC 109cc closed chamber .0065 .0070 .0193
BBC 118cc open chamber .0050 .0070 .0193
Ford 65-77 289-302 engine .0060 .0100 .0143
Ford 69-77 351W engine .0055 .0100 .0143
Ford 78-up 302/5.0L/351W engines except 86 5.0 HO .0045 .0100 .0143
Ford 351C engine .0050 .0100 .0143
Ford 69-71 429-460 engine, quench head .0050
.0100 .0143
Ford 429-460 engine, open chamber head .0030
.0100 .0143
Chrysler 273-318ci engine, 57-61cc chamber .0053 .0095 .0144
Chrysler 340-360ci engine, 63-71cc chamber .0048 .0095 .0144
Chrysler B/RB engine, 66.5cc or 73.5cc chamber .0062 .0123 not required
Chrysler B/RB engine, 79/81/83cc chamber .0042 .0123 not required
Chrysler B/RB Max Wedge Engine, 81 or 86cc chamber .0050 .0120 .0170
Olds 403-455 Big Block engines .0050 .0130 .0169
Olds 350 Small Block engine .0060 .0130 .0169
Pontiac 65-67 .0061 .0061 not required
Pontiac 68-70 .0052 .0052 not required
Pontiac 71-79 .0047 .0047 not required

SITES to help:
http://home.isoa.net/~mharrisj/mill.html
http://victorylibrary.com/mopar/intake-mill-c.htm
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Old 10-15-2004, 12:41 AM
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Quote:
Originally posted by machine shop tom
A good ballpark figure for the SBC is .007" per CC.

tom
Tom - When angle milling a set of SBC double humps .125", what cc's do they come out at? I was thinking it was 12-14cc's less, just not sure if that's right.
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Old 10-15-2004, 03:44 PM
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I don't think angle milling .125" from SBC heads is advisable or even practical. I've never been a fan of angle milling. I think there are better ways of gaining compression and improving the valve angle without filling and re-drilling the spark plug cooling holes, spot facing the bolt holes, correcting the intake manifold mating surface angle, etc. If you need very small chamber heads, Dart makes an SBC head with 49cc chambers.

http://www.racersoutlet.com/cylinder...iron_eagle.htm

tom
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Old 12-03-2010, 02:18 AM
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Blueprinting an Engine (Olds 350 and 403)

Thanks for the Head Milling vs. Compression chart.

When cleaning the head chamber area, save the material removed from each, to determine the balanced change in chamber cc (this might include some stone or cutter material).

How might you determine the linear amount (inches) removed from milling a head, or the intake manifold for that matter, when they are not known?

Where can we obtain engineering drawings for the blueprinting an engine?
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Old 12-03-2010, 09:35 AM
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Quote:
Originally Posted by GSXMEN
Tom - When angle milling a set of SBC double humps .125", what cc's do they come out at? I was thinking it was 12-14cc's less, just not sure if that's right.
Most come out to about 50cc.
I've seen many that the outer edge was thin as a knife blade.
I agree ^^^, better & cheaper options are available today.
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Old 12-03-2010, 12:02 PM
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milling heads

dont do it man
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Old 12-03-2010, 12:17 PM
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This is a common case of thinking outside the box. I have a buddy that runs a limited class dirt street stock the has factory 76cc head that are straight milled .100, in fact he has 3 engines with heads milled this much. The only time these heads have failed is when something went wrong in the bottom end. I will admit these heads are throw aways and I would never suggest doing this to a street motor. He also doesn't baby these motors. They see 6500 rpm and it is quite common for these motors to get hot every once in a while. Due to the fact that this guy still races and this is kind of a racing secret I'm not going in to anymore detail. All I can say is it can be done, but only should be done when there is no other options.
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Old 12-03-2010, 04:20 PM
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Quote:
Originally Posted by SSedan64
Most come out to about 50cc.
I've seen many that the outer edge was thin as a knife blade.
I agree ^^^, better & cheaper options are available today.


man!!! i didn't think they would have that much of a hard deck

i had my Dart heads (64cc) flat milled .040" and then re-cc'd afterwards and they all came out really close to 58.5cc. so the general rule of 1cc per .007" is pretty acurate in my case
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Old 12-03-2010, 05:04 PM
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Quote:
Originally Posted by vpd66
This is a common case of thinking outside the box. I have a buddy that runs a limited class dirt street stock the has factory 76cc head that are straight milled .100, in fact he has 3 engines with heads milled this much. The only time these heads have failed is when something went wrong in the bottom end. I will admit these heads are throw aways and I would never suggest doing this to a street motor. He also doesn't baby these motors. They see 6500 rpm and it is quite common for these motors to get hot every once in a while. Due to the fact that this guy still races and this is kind of a racing secret I'm not going in to anymore detail. All I can say is it can be done, but only should be done when there is no other options.
It's no secret, this has been going on for better than 40 years on SBC heads. It is what you have to do if the rules state you have to use a flat top or dish piston and you need to get compression up.
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Old 12-03-2010, 07:53 PM
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Quote:
Originally Posted by my87Z
man!!! i didn't think they would have that much of a hard deck

i had my Dart heads (64cc) flat milled .040" and then re-cc'd afterwards and they all came out really close to 58.5cc. so the general rule of 1cc per .007" is pretty acurate in my case
The knife edgers were angle milled, pretty much even with the spark plug boss in the Chamber. It is very common & I never saw problems either except as stated above when the rotating assembly let loose. Those thin Decks crack easily when they get smacked.
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