LS1TECH - Camaro and Firebird Forum Discussion

Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

How much can I mill?

Thread Tools
 
Search this Thread
 
Old Mar 7, 2012 | 01:38 PM
Share
  #1  
CameronVic's Avatar
CameronVic
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2011
Posts: 440
Likes: 2
Default How much can I mill?
2003 5.3 shortblock and am putting on 241 heads .051ish gaskets, would like to have 9.5:1 compression. Gonna be turbo on E85 and I'm just wondering if anyone knows how much you can mill a 241 and not run into problems with intake ports lining up. I have an LS1 intake. Thanks ahead of time.
Reply
0
Old Mar 7, 2012 | 02:39 PM
Share
  #2  
mark21742's Avatar
mark21742
TECH Addict
 
Joined: Sep 2009
Posts: 2,481
Likes: 5
From: PA/MD
Default
I have my 241s milled down to 57cc chambers (somewhere around .040"). If I were you id just do a clean up mill on the heads and run a thinner head gasket to keep a tight quench, around a .040" gasket.
Reply
0
Old Mar 7, 2012 | 03:53 PM
Share
  #3  
CameronVic's Avatar
CameronVic
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2011
Posts: 440
Likes: 2
Default
I'm cheap and bought the cheapest gaskets already. I have to get a cleanup mill anyway and I can get as much milled off as I want for the same price. You have an LS1 intake with that .040 mill?
Reply
0
Old Mar 7, 2012 | 05:38 PM
Share
  #4  
mark21742's Avatar
mark21742
TECH Addict
 
Joined: Sep 2009
Posts: 2,481
Likes: 5
From: PA/MD
Default
No, I'm running an Edelbrock proflo xt
Reply
0
Old Mar 7, 2012 | 11:03 PM
Share
  #5  
CameronVic's Avatar
CameronVic
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2011
Posts: 440
Likes: 2
Default
Well I've been advised against milling on a FI application. If stock compression is 9.5:1 with 706 (61ish cc) chambers, what would 241 heads (67cc) make it?
Reply
0
Old Mar 8, 2012 | 04:59 AM
Share
  #6  
mark21742's Avatar
mark21742
TECH Addict
 
Joined: Sep 2009
Posts: 2,481
Likes: 5
From: PA/MD
Default
Around 9.2:1 I think
Reply
0
Old Mar 8, 2012 | 05:57 AM
Share
  #7  
01ssreda4's Avatar
01ssreda4
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default
Originally Posted by mark21742
I have my 241s milled down to 57cc chambers (somewhere around .040"). If I were you id just do a clean up mill on the heads and run a thinner head gasket to keep a tight quench, around a .040" gasket.
Sure you math aint off there fella? You went from a 67cc chamber down to a 57cc with only .040 off
Reply
0

Trending Topics

Old Mar 8, 2012 | 06:08 AM
Share
  #8  
Old Geezer's Avatar
Old Geezer
TECH Senior Member
iTrader: (3)
 
Joined: Jun 2004
Posts: 5,639
Likes: 71
From: GA, USA
Default
"I'm cheap and bought the cheapest gaskets already."........With a turbo?????
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Mar 8, 2012 | 06:21 AM
Share
  #9  
mark21742's Avatar
mark21742
TECH Addict
 
Joined: Sep 2009
Posts: 2,481
Likes: 5
From: PA/MD
Default
Originally Posted by 01ssreda4
Sure you math aint off there fella? You went from a 67cc chamber down to a 57cc with only .040 off
Sould say "this time" we took .040" off....the heads had been milled before too, so not sure on my total mill, but the chambers were cc'ed at 57cc
Reply
0
Old Mar 8, 2012 | 08:18 AM
Share
  #10  
01ssreda4's Avatar
01ssreda4
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default
Having intake alignment issues? I've heard that is common with milling over .040 but never done it myself.
Reply
0
Old Mar 8, 2012 | 08:27 AM
Share
  #11  
CameronVic's Avatar
CameronVic
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2011
Posts: 440
Likes: 2
Default
Originally Posted by Old Geezer
"I'm cheap and bought the cheapest gaskets already."........With a turbo?????
yea?
Originally Posted by 01ssreda4
Having intake alignment issues?
No? That's why I started a thread, so I wouldn't. Lol.
Reply
0
Old Mar 8, 2012 | 08:47 AM
Share
  #12  
BlackScreaminMachine's Avatar
BlackScreaminMachine
Internet Mechanic
20 Year Member
iTrader: (17)
 
Joined: May 2005
Posts: 9,830
Likes: 2
From: Wallingford CT
Default
Originally Posted by CameronVic
2003 5.3 shortblock and am putting on 241 heads .051ish gaskets, would like to have 9.5:1 compression. Gonna be turbo on E85 and I'm just wondering if anyone knows how much you can mill a 241 and not run into problems with intake ports lining up. I have an LS1 intake. Thanks ahead of time.
This has fail written all over it.



Go to the forced induction section as you will get more answer due to your unique request to raise static compression on a FI motor on fuel that can be inconsistant.

- By trying to mill your shrinking your window of safety when it comes to tuning and survivability of the motor.
Reply
0
Old Mar 8, 2012 | 09:57 AM
Share
  #13  
01ssreda4's Avatar
01ssreda4
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default
Originally Posted by CameronVic
yea?
No? That's why I started a thread, so I wouldn't. Lol.
I'm not asking you, I'm asking the one who said he milled his head 10cc. I just had a set of heads done .045 and they milled the intake flange to compensate.
Reply
0
Old Mar 8, 2012 | 10:04 AM
Share
  #14  
mark21742's Avatar
mark21742
TECH Addict
 
Joined: Sep 2009
Posts: 2,481
Likes: 5
From: PA/MD
Default
Originally Posted by 01ssreda4
Having intake alignment issues? I've heard that is common with milling over .040 but never done it myself.
Not sure how a stock intake would fit on mine, but the Edelbrock dropped right down in place and bolted right up with no sealing issues
Reply
0
Old Mar 8, 2012 | 03:21 PM
Share
  #15  
CameronVic's Avatar
CameronVic
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2011
Posts: 440
Likes: 2
Default
Originally Posted by BlackScreaminMachine
- By trying to mill your shrinking your window of safety when it comes to tuning and survivability of the motor.
Originally Posted by CameronVic
Well I've been advised against milling on a FI application. If stock compression is 9.5:1 with 706 (61ish cc) chambers, what would 241 heads (67cc) make it?
So I take it you only read the first post?
Reply
0
Tags
Back to Subforum
Generation III Internal Engine
View Next Unread
Correct head gasket for LS6 heads on 2000 LS1 block




Advanced Search

All times are GMT -5. The time now is 03:42 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE