Head Milling and Compression
#1
Member
Thread Starter
Join Date: Oct 2001
Location: S.Jersey
Posts: 383
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro
Engine: 355
Transmission: TH-350
Head Milling and Compression
How many thousands of an inch equals 1 cc?
This relates to milling heads just in case you were wondering lol..
Thanks
This relates to milling heads just in case you were wondering lol..
Thanks
Last edited by IROCZTWENTYGR8; 10-30-2003 at 08:38 PM.
#2
Supreme Member
.....
Head Milling vs. Compression
Ever wonder how much you need to mill off your head to make a cc difference in the combustion chamber size. What about the difference that makes in 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
Cylinder head Mill head | intake face | manifold bottom
to reduce 1cc
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
Head Milling vs. Compression
Ever wonder how much you need to mill off your head to make a cc difference in the combustion chamber size. What about the difference that makes in 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
Cylinder head Mill head | intake face | manifold bottom
to reduce 1cc
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
#3
Supreme Member
Join Date: Nov 2001
Location: Jacksonville, NC
Posts: 1,886
Likes: 0
Received 0 Likes
on
0 Posts
Car: Guess
Engine: Crazy 8
Transmission: So close to being a manual I can taste it
Re: Question for the math experts!
Originally posted by 1QWIKZ
How many thousands of an inch equals 1 cc?
This relates to milling heads just in case you were wondering lol..
Thanks
How many thousands of an inch equals 1 cc?
This relates to milling heads just in case you were wondering lol..
Thanks
That is an extremely difficult question to answer.
To start with, a THOUSANDTH of an inch (.001) is a unit of length.
A CC, is a unit of volume. And the units are in a different system so a conversion is required.
I assume the purpose of this exercise is to gain some CR. Your best bet would be to mill the heads and then measure the cylinder volume and the chamber volume and then you can get your exact CR. Just my 2 cts
#4
Member
Thread Starter
Join Date: Oct 2001
Location: S.Jersey
Posts: 383
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro
Engine: 355
Transmission: TH-350
Thanks for replying 88, and 92..............This was a question posed at work and I never heard or saw a conversion between the 2 so I figured that somebody on the board could help me out and 88 just ripped some figures out with the quickness lol....Thanks again 88 I'll so the guys this post tomorrow...
#6
Member
Thread Starter
Join Date: Oct 2001
Location: S.Jersey
Posts: 383
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro
Engine: 355
Transmission: TH-350
Originally posted by Apeiron
It depends on the shape and size of the chamber.
It depends on the shape and size of the chamber.
#7
Junior Member
Join Date: Apr 2005
Location: Chattanooga, TN
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: 383 Stroker
Transmission: 700R4
Ok, I am a machinist, and what I do at the machine shop is, I build cylinder heads. For every one CC, you take off roughly .006, that's six thousandts. That goes for any shape size head you can think of. It dosent matter if it is a FORD or Chevrolet or Chrysler, Honda... whatever
Trending Topics
#9
Junior Member
Join Date: Apr 2005
Location: Chattanooga, TN
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: 383 Stroker
Transmission: 700R4
I have alway's herd that it is .006, but I could be wrong, I asked my boss and he said that some heads are different, so my mistake. Small blocks are around .006-.007 a CC. If you know what CC you want you can fill the chamber up with varisol to the correct CC, and then measure so see how much you need to cut off.
Thread
Thread Starter
Forum
Replies
Last Post
92projectcamaro
Engine/Drivetrain/Suspension Parts for Sale
11
01-18-2016 08:00 AM
New2Chevy
Engine/Drivetrain/Suspension Parts for Sale
2
09-28-2015 12:35 AM